Note 7: Segment Information For a detailed discussion of the Companys accounting principles and its reportable segments see note 8 Segment Information in the Companys consolidated financial statements in Item 8. Financial Statements and Supplementary Data and Item 7. Managements Discussion and Analysis of Financial Condition and Results of Operations in the Companys Annual Report on Form 10-K for the year ended December 31, 2018 . The following tables present the Companys reportable segment results including EBITDA (earnings before net interest expense, income taxes, depreciation, and amortization) for the three months ended March 31, 2019 and 2018 : Three months ended March 31, 2019 (in millions) Global Business Solutions Global Financial Solutions Network &amp; Security Solutions Corporate Total Revenues: Revenues $ 1,379 $ 370 $ 361 $  $ 2,110 Equity earnings in affiliates 8 (1 )   7 Total segment revenues $ 1,387 $ 369 $ 361 $  $ 2,117 Depreciation and amortization $ 122 $ 83 $ 28 $  $ 233 Segment EBITDA 471 147 195 (59 ) 754 Three months ended March 31, 2018 (in millions) Global Business Solutions Global Financial Solutions Network &amp; Security Solutions Corporate Total Revenues: Revenues $ 1,310 $ 401 $ 362 $  $ 2,073 Equity earnings in affiliates 8 (1 )   7 Total segment revenues $ 1,318 $ 400 $ 362 $  $ 2,080 Depreciation and amortization $ 125 $ 88 $ 29 $  $ 242 Segment EBITDA 434 166 175 (45 ) 730 The following table presents a reconciliation of reportable segment amounts to the Companys consolidated balances for the three months ended March 31, 2019 and 2018 : Three months ended March 31, (in millions) 2019 2018 Total segment revenues $ 2,117 $ 2,080 Adjustments: Non wholly-owned entities (a) 7 4 Reimbursable items 192 198 Consolidated revenues $ 2,316 $ 2,282 Total segment EBITDA $ 754 $ 730 Adjustments: Non wholly-owned entities (a) 13 18 Depreciation and amortization (246 ) (250 ) Interest expense, net (203 ) (233 ) Loss on debt extinguishment (1 )  Other items (b) (63 ) (63 ) Stock-based compensation (56 ) (74 ) Income tax expense (29 ) (27 ) Net income attributable to First Data Corporation $ 169 $ 101 (a) Net adjustment to reflect the Company's proportionate share of the results of the Company's investments in businesses accounted for under the equity method and consolidated subsidiaries with noncontrolling ownership interests. Segment revenue for the Company's significant affiliates is reflected based on the Company's proportionate share of the results of the Company's investments in businesses accounted for under the equity method and consolidated subsidiaries with noncontrolling ownership interests. For other affiliates, the Company includes equity earnings in affiliates, excluding amortization expense, in segment revenue. (b) See "Other operating expenses, net" and "Other expense" in the Company's unaudited consolidated statements of income. The following table presents a reconciliation of reportable segment depreciation and amortization expense to the amounts in the consolidated balances in the unaudited consolidated statements of cash flows and unaudited consolidated statements of income for the three months ended March 31, 2019 and 2018 : Three months ended March 31, (in millions) 2019 2018 Segment depreciation and amortization $ 233 $ 242 Adjustments for non wholly-owned entities 14 16 Amortization of payments for customer contracts (a) 14 13 Total consolidated depreciation and amortization per unaudited consolidated statements of cash flows 261 271 Amortization of equity method investments (b) (1 ) (8 ) Amortization of payments for customer contracts (a) (14 ) (13 ) Total consolidated depreciation and amortization per unaudited consolidated statements of income $ 246 $ 250 (a) Included in "Revenues excluding reimbursable items" as contra-revenue in the Company's unaudited consolidated statements of income. (b) Included in "Equity earnings in affiliates" in the Company's unaudited consolidated statements of income.