Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income tax benefit (provision) on fair market value adjustment on cash flow hedges	$ (1)	$ 36	$ 2	$ 45
Cost of Services
Income tax provision on reclassification adjustment for net realized gain on cash flow hedges	0	0	0	0
Interest Expense
Income tax provision on reclassification adjustment for net realized gain on cash flow hedges	$ 1	$ 0	$ 2	$ 1