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Income Taxes (Schedule of Deferred Income Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred income tax assets:    
Net operating loss carryforwards $ 130 $ 223
Employee benefit accruals 69 111
Other deferred tax assets 106 151
Total gross deferred income tax assets 305 485
Less valuation allowance (129) (177)
Total deferred income tax assets 176 308
Deferred income tax liabilities:    
Amortization of goodwill and intangible assets 1,468 2,464
Deferred contract costs 96 131
Other deferred tax liabilities 90 75
Total deferred income tax liabilities 1,654 2,670
Net deferred income tax liability $ 1,478 $ 2,362