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Revenue Recognition - Impacts of ASC 606 on Consolidated Statement of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income	$ 286	$ 227	$ 251	$ 423	$ 546	$ 232	$ 221	$ 247	$ 1,187	$ 1,246	$ 930
Fair market value adjustment on cash flow hedges, net of income tax benefit of $2 million									(5)	4	0
Foreign currency translation									(11)	12	(9)
Total other comprehensive (loss) income									(13)	22	(2)
Comprehensive income	$ 298	$ 214	$ 241	$ 421	$ 547	$ 236	$ 229	$ 256	1,174	1,268	928
Income tax provision on fair market value adjustment on cash flow hedges									(2)	$ 2	$ 0
Adjustments | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income									(51)
Fair market value adjustment on cash flow hedges, net of income tax benefit of $2 million									0
Foreign currency translation									0
Total other comprehensive (loss) income									0
Comprehensive income									(51)
Balances without adoption of ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income									1,136
Fair market value adjustment on cash flow hedges, net of income tax benefit of $2 million									(5)
Foreign currency translation									(11)
Total other comprehensive (loss) income									(13)
Comprehensive income									1,123
Cost of Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Reclassification adjustment for net realized (gains) losses on cash flow hedges									(1)
Reclassification adjustment for net realized (gains) losses on cash flow hedges, tax									0
Cost of Services | Adjustments | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Reclassification adjustment for net realized (gains) losses on cash flow hedges									0
Cost of Services | Balances without adoption of ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Reclassification adjustment for net realized (gains) losses on cash flow hedges									(1)
Interest Expense
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Reclassification adjustment for net realized (gains) losses on cash flow hedges									4
Reclassification adjustment for net realized (gains) losses on cash flow hedges, tax									2
Interest Expense | Adjustments | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Reclassification adjustment for net realized (gains) losses on cash flow hedges									0
Interest Expense | Balances without adoption of ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Reclassification adjustment for net realized (gains) losses on cash flow hedges									$ 4

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