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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income tax benefit on fair market value adjustment on cash flow hedges | $ 36 | $ 2 | $ 45 | $ 2
Cost of Services |  |  |  |
Income (benefit) expense on reclassification adjustment for net realized gain on cash flow hedges | 0 |  |  |
Income (benefit) expense on reclassification adjustment for net realized gain on cash flow hedges |  | 0 | 0 | (1)
Interest Expense |  |  |  |
Income (benefit) expense on reclassification adjustment for net realized gain on cash flow hedges | $ 0 |  |  |
Income (benefit) expense on reclassification adjustment for net realized gain on cash flow hedges |  | $ 0 | $ 1 | $ 1

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