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Income Taxes (Schedule of Deferred Income Tax Assets and Liabilities) (Classification) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Disclosure [Abstract] |  |
Current assets | $ 101 | $ 100
Noncurrent assets (included in other noncurrent assets) | 25 | 22
Total deferred income tax assets | 126 | 122
Current liabilities (included in accounts payable and accrued liabilities) | (4) | (2)
Noncurrent liabilities | (2,484) | (2,658)
Total deferred income tax liabilities | (2,488) | (2,660)
Net deferred income tax liability | $ 2,362 | $ 2,538

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