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Income Taxes (Schedule of Deferred Income Tax Assets and Liabilities) (Classification) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Current assets | $ 0 | $ 101
Noncurrent assets (included in other noncurrent assets) | 30 | 25
Total deferred income tax assets | 30 | 126
Current liabilities (included in accounts payable and accrued liabilities) | 0 | (4)
Noncurrent liabilities | (1,508) | (2,484)
Total deferred income tax liabilities | (1,508) | (2,488)
Net deferred income tax liability | $ (1,478) | $ (2,362)

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