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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
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 (1,468) (2,445)
Total deferred income tax liabilities (1,468) (2,449)
Net deferred income tax liability $ (1,438) $ (2,323)