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Income Taxes (Schedule of Deferred Income Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax assets:    
Net operating loss carryforwards $ 108 $ 130
Employee benefit accruals 58 69
Other deferred tax assets 105 128
Total gross deferred income tax assets 271 327
Less valuation allowance (116) (129)
Total deferred income tax assets 155 198
Deferred income tax liabilities:    
Amortization of goodwill and intangible assets 1,291 1,452
Deferred contract costs 109 94
Other deferred tax liabilities 83 90
Total deferred income tax liabilities 1,483 1,636
Net deferred income tax liability $ 1,328 $ 1,438