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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

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