REPORTABLE SEGMENTS The Companys operating segments are determined based on: (i) financial information reviewed by its chief operating decision maker ("CODM"), the Chief Executive Officer ("CEO"), (ii) internal management and related reporting structure, and (iii) the basis upon which the CEO makes resource allocation decisions. The Company's operating segments did not change as a result of the acquisition of Scripps Networks. The accounting policies of the reportable segments are the same as the Companys, except that certain inter-segment transactions that are eliminated for consolidation are not eliminated at the segment level. Inter-segment transactions primarily include advertising and content purchases. The Company evaluates the operating performance of its segments based on financial measures such as revenues and adjusted operating income before depreciation and amortization (Adjusted OIBDA). Adjusted OIBDA is defined as operating income excluding: (i) employee share-based compensation, (ii) depreciation and amortization, (iii) restructuring and other charges, (iv) certain impairment charges, (v) gains and losses on business and asset dispositions, (vi) certain inter-segment eliminations related to production studios, (vii) third-party transaction costs directly related to the acquisition and integration of Scripps Networks and other transactions, and (viii) other items impacting comparability, such as the non-cash settlement of a withholding tax claim. (See Note 19.) The Company uses this measure to assess the operating results and performance of its segments, perform analytical comparisons, identify strategies to improve performance and allocate resources to each segment. The Company believes Adjusted OIBDA is relevant to investors because it allows them to analyze the operating performance of each segment using the same metric management uses. The Company excludes share-based compensation, restructuring and other charges, certain impairment charges, gains and losses on business and asset dispositions and Scripps Networks transaction and integration costs from the calculation of Adjusted OIBDA due to their impact on comparability between periods. The Company also excludes depreciation of fixed assets and amortization of intangible assets, as these amounts do not represent cash payments in the current reporting period. Certain corporate expenses are excluded from segment results to enable executive management to evaluate segment performance based upon the decisions of segment executives. Total Adjusted OIBDA should be considered in addition to, but not a substitute for, operating income, net income and other measures of financial performance reported in accordance with GAAP. Effective January 1, 2019, the Company's definition of Adjusted OIBDA was modified to exclude all share-based compensation, whereas only mark-to-market share-based compensation was previously excluded. Over time, the Company has moved to a higher percentage of equity classified awards (in lieu of liability classified awards, which require mark-to-market accounting) under its stock incentive plans and expects to continue this practice in future periods. Since most equity classified awards are non-cash expenses not entirely under management control, we have elected to exclude all employee share-based compensation from Adjusted OIBDA beginning in 2019. The revised definition of Adjusted OIBDA will be used by the Company's CODM in evaluating segment performance in 2019. Accordingly, prior period amounts have been recast to reflect the current definition. The tables below present summarized financial information for each of the Companys reportable segments, other, and corporate and inter-segment eliminations (in millions). Revenues Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 U.S. Networks $ 1,725 $ 1,674 $ 5,340 $ 4,628 International Networks 950 916 2,922 3,065 Other 3 3 8 52 Corporate and inter-segment eliminations  (1 )  (1 ) Total revenues $ 2,678 $ 2,592 $ 8,270 $ 7,744 Adjusted OIBDA Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 U.S. Networks $ 1,005 $ 901 $ 3,192 $ 2,536 International Networks 237 254 742 727 Other 1  3 3 Corporate and inter-segment eliminations (117 ) (95 ) (371 ) (275 ) Total Adjusted OIBDA $ 1,126 $ 1,060 $ 3,566 $ 2,991 Reconciliation of Net Income available to Discovery, Inc. to Total Adjusted OIBDA Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Net income available to Discovery, Inc. $ 262 $ 117 $ 1,593 $ 325 Net income attributable to redeemable noncontrolling interests 6 5 15 16 Net income attributable to noncontrolling interests 29 13 94 41 Income tax expense 147 43 29 146 Income before income taxes 444 178 1,731 528 Other expense, net 1 15 10 84 Loss (income) from equity investees, net 11 (9 ) 20 53 Loss on extinguishment of debt   28  Interest expense, net 163 185 515 558 Operating income 619 369 2,304 1,223 Gain on disposition    (84 ) Restructuring and other charges 8 224 20 652 Impairment of goodwill 155  155  Depreciation and amortization 322 398 1,014 1,001 Employee share-based compensation 11 43 80 92 Transaction and integration costs 11 26 22 107 Settlement of a withholding tax claim   (29 )  Total Adjusted OIBDA $ 1,126 $ 1,060 $ 3,566 $ 2,991 Total Assets September 30, 2019 December 31, 2018 U.S. Networks $ 18,420 $ 18,683 International Networks 7,534 7,208 Other 173 227 Corporate and inter-segment eliminations 6,698 6,432 Total assets $ 32,825 $ 32,550 Total assets for corporate and inter-segment eliminations include goodwill that is allocated to the Companys segments. The presentation of segment assets in the table above is consistent with the financial reports that are reviewed by the Companys CEO.