Reportable Segments The Registrants determination of reportable segments considers the strategic operating units under which the Registrants CODM manages sales, allocates resources and assesses performance of various products and services to wholesale or retail customers in differing regulatory environments. As of January 1, 2020, each Registrants CODM views net income as the measure of profit or loss for the reportable segments rather than the previous measure of operating income. Certain prior year amounts have been reclassified to conform to the current year presentation. As of September 30, 2020, reportable segments by Registrant were as follows: Registrant Houston Electric T&amp;D Indiana Electric Integrated Natural Gas Distribution Midstream Investments CenterPoint Energy X X X X Houston Electric X CERC X  CenterPoint Energys and Houston Electrics Houston Electric T&amp;D reportable segment consists of electric transmission and distribution services in the Texas Gulf Coast area.  CenterPoint Energys Indiana Electric Integrated reportable segment consists of electric transmission and distribution services primarily to southwestern Indiana and includes power generation and wholesale power operations.  CenterPoint Energys Natural Gas Distribution reportable segment consists of (i) intrastate natural gas sales to, and natural gas transportation and distribution for residential, commercial, industrial and institutional customers in Arkansas, Indiana, Louisiana, Minnesota, Mississippi, Ohio, Oklahoma and Texas; (ii) permanent pipeline connections through interconnects with various interstate and intrastate pipeline companies through CEIP, formerly included in the Energy Services reportable segment; and (iii) temporary delivery of LNG and CNG throughout the contiguous 48 states through MES, formerly included in the Energy Services reportable segment.  CERCs Natural Gas Distribution reportable segment consists of (i) intrastate natural gas sales to, and natural gas transportation and distribution for residential, commercial, industrial and institutional customers in Arkansas, Louisiana, Minnesota, Mississippi, Oklahoma and Texas; (ii) permanent pipeline connections through interconnects with various interstate and intrastate pipeline companies through CEIP, formerly included in the Energy Services reportable segment; and (iii) temporary delivery of LNG and CNG throughout the contiguous 48 states through MES, formerly included in the Energy Services reportable segment.  CenterPoint Energys Midstream Investments reportable segment consists of the equity investment in Enable (excluding the Enable Series A Preferred Units). CenterPoint Energys Corporate and Other consists of energy performance contracting and sustainable infrastructure services through ESG and other corporate operations which support all of the business operations of CenterPoint Energy. CERCs Corporate and Other consists primarily of corporate operations which support all of the business operations of CERC. Discontinued Operations (CenterPoint Energy and CERC) On February 3, 2020, CenterPoint Energy, through its subsidiary VUSI, entered into the Securities Purchase Agreement to sell the Infrastructure Services Disposal Group, which consists of underground pipeline construction and repair services. Accordingly, the previously reported Infrastructure Services reportable segment has been eliminated. The transaction closed on April 9, 2020. See Note 3 for further information. Additionally, on February 24, 2020, CenterPoint Energy, through its subsidiary CERC Corp., entered into the Equity Purchase Agreement to sell the Energy Services Disposal Group, which consists of non-rate regulated natural gas sales and service operations. Accordingly, the previously reported Energy Services reportable segment has been eliminated. The transaction closed on June 1, 2020. See Note 3 for further information. Financial data for reportable segments is as follows, including Corporate and Other, Eliminations and Discontinued Operations for reconciliation purposes: CenterPoint Energy Three Months Ended September 30, 2020 2019 Revenues from External Customers Equity in Earnings of Unconsolidated Affiliates Net Income (Loss) Revenues from External Customers Equity in Earnings of Unconsolidated Affiliates Net Income (Loss) (in millions) Houston Electric T&amp;D $ 828 (1) $  $ 157 $ 859 (1) $  $ 185 Indiana Electric Integrated 157  31 165  34 Natural Gas Distribution 560  5 541  6 Midstream Investments (2)  (67) (62)  77 50 Corporate and Other 77  (4) 93  (24) Continuing Operations $ 1,622 $ (67) 127 $ 1,658 $ 77 251 Discontinued Operations, net (6) 19 Consolidated $ 121 $ 270 Nine Months Ended September 30, 2020 2019 Revenues from External Customers Equity in Earnings of Unconsolidated Affiliates Net Income (Loss) Revenues from External Customers Equity in Earnings of Unconsolidated Affiliates Net Income (Loss) (in millions) Houston Electric T&amp;D $ 2,186 (1) $  $ 281 $ 2,313 (1) $  $ 315 Indiana Electric Integrated 414  (121) 388  41 Natural Gas Distribution 2,519  242 2,629  149 Midstream Investments (2)  (1,499) (1,165)  213 124 Corporate and Other 245  (28) 215  (84) Continuing Operations $ 5,364 $ (1,499) (791) $ 5,545 $ 213 545 Discontinued Operations, net (182) 89 Consolidated $ (973) $ 634 (1) Houston Electric T&amp;Ds revenues from major external customers are as follows (CenterPoint Energy and Houston Electric): Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 (in millions) Affiliates of NRG $ 243 $ 231 $ 573 $ 547 Affiliates of Vistra Energy Corp. 128 83 301 196 (2) Includes the impairment of CenterPoint Energys equity method investment in Enable of $1,541 million recorded during the nine months ended September 30, 2020 and CenterPoint Energys interest in Enables $225 million impairment on an equity method investment during the three and nine months ended September 30, 2020. Houston Electric consists of a single reportable segment; therefore, a tabular reportable segment presentation has not been included herein. CERC Three Months Ended September 30, 2020 2019 Revenues from External Customers Net Income (Loss) Revenues from External Customers Net Income (Loss) (in millions) Natural Gas Distribution $ 422 $ 1 $ 415 $ 5 Corporate and Other 4 (7) 5 (15) Continuing Operations $ 426 (6) $ 420 (10) Discontinued Operations, net 2 3 Consolidated $ (4) $ (7) Nine Months Ended September 30, 2020 2019 Revenues from External Customers Net Income (Loss) Revenues from External Customers Net Income (Loss) (in millions) Natural Gas Distribution $ 1,910 $ 155 $ 2,152 $ 134 Corporate and Other 10 (13) 6 (32) Continuing Operations $ 1,920 142 $ 2,158 102 Discontinued Operations, net (66) 57 Consolidated $ 76 $ 159 CenterPoint Energy and CERC Total Assets September 30, 2020 December 31, 2019 CenterPoint Energy CERC CenterPoint Energy CERC (in millions) Houston Electric T&amp;D $ 11,296 $  $ 11,264 $  Indiana Electric Integrated 3,142  3,168  Natural Gas Distribution 14,297 7,809 14,105 7,698 Midstream Investments 805  2,473  Corporate and Other, net of eliminations 3,165 (30) 2,555 (90) Continuing Operations 32,705 7,779 33,565 7,608 Assets Held for Sale   1,964 904 Consolidated $ 32,705 $ 7,779 $ 35,529 $ 8,512