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Income Taxes (Schedule of Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss carryforwards | $ 130 | $ 223
Employee benefit accruals | 69 | 111
Other deferred tax assets | 128 | 158
Total gross deferred income tax assets | 327 | 492
Less valuation allowance | (129) | (177)
Total deferred income tax assets | 198 | 315
Deferred income tax liabilities: |  |
Amortization of goodwill and intangible assets | 1,452 | 2,436
Deferred contract costs | 94 | 127
Other deferred tax liabilities | 90 | 75
Total deferred income tax liabilities | 1,636 | 2,638
Net deferred income tax liability | $ 1,438 | $ 2,323

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