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Income Taxes (Schedule of Deferred Income Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred income tax assets:    
Net operating loss carryforwards $ 221 $ 177
Employee benefit accruals 155 177
Other deferred tax assets 204 142
Total gross deferred income tax assets 580 496
Less valuation allowance (204) (178)
Total deferred income tax assets 376 318
Deferred income tax liabilities:    
Amortization of goodwill and intangible assets (3,945) (4,123)
Foreign currency translation adjustment (95) (208)
Deferred contract costs (173) (125)
Other deferred tax liabilities (140) (105)
Total deferred income tax liabilities (4,353) (4,561)
Net deferred income tax liability $ (3,977) $ (4,243)