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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Income tax (provision) benefit on fair market value adjustment on cash flow hedges | $ 0 | $ 3
Income tax provision on unrealized gain on defined benefit plans | 0 |
Cost of Services |  |
Income tax provision (benefit) on reclassification adjustment for net realized gain on cash flow hedges included in net interest expense | 0 | 0
Interest Expense |  |
Income tax provision (benefit) on reclassification adjustment for net realized gain on cash flow hedges included in net interest expense | $ 1 | $ 1

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