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Income Taxes (Schedule of Deferred Income Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Deferred income tax assets:    
Net operating loss carryforwards $ 223 $ 228
Employee benefit accruals 111 98
Other deferred tax assets 151 112
Total gross deferred income tax assets 485 438
Less valuation allowance (177) (167)
Total deferred income tax assets 308 271
Deferred income tax liabilities:    
Amortization of goodwill and intangible assets 2,464 2,606
Deferred contract costs 131 103
Other deferred tax liabilities 75 100
Total deferred income tax liabilities 2,670 2,809
Net deferred income tax liability $ 2,362 $ 2,538