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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 128 158
Total gross deferred income tax assets 327 492
Less valuation allowance (129) (177)
Total deferred income tax assets 198 315
Deferred income tax liabilities:    
Amortization of goodwill and intangible assets 1,452 2,436
Deferred contract costs 94 127
Other deferred tax liabilities 90 75
Total deferred income tax liabilities 1,636 2,638
Net deferred income tax liability $ 1,438 $ 2,323