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Income Taxes (Schedule of Deferred Income Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Deferred income tax assets:    
Net operating loss carryforwards $ 177 $ 108
Employee benefit accruals 177 58
Other deferred tax assets 142 105
Total gross deferred income tax assets 496 271
Less valuation allowance (178) (116)
Total deferred income tax assets 318 155
Deferred income tax liabilities:    
Amortization of goodwill and intangible assets (4,123) (1,291)
Foreign currency translation adjustment (208) 0
Deferred contract costs (125) (109)
Other deferred tax liabilities (105) (83)
Total deferred income tax liabilities (4,561) (1,483)
Net deferred income tax liability $ (4,243) $ (1,328)