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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income tax (provision) benefit on fair market value adjustment on cash flow hedges | $ (2) | $ 46 | $ 2
Income tax benefit on unrealized gain/(loss) on defined benefit plans | 2 | 1 |
Cost of Processing and Services |  |  |
Income tax provision (benefit) on reclassification adjustment for net realized gain on cash flow hedges | 0 | 0 | 0
Interest Expense |  |  |
Income tax provision (benefit) on reclassification adjustment for net realized gain on cash flow hedges | $ 5 | $ 3 | $ 2

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