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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
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