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Income Taxes (Income Tax Payables and Income Tax Receivables) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Income taxes receivable—current $ 147 $ 136
Total income taxes receivable 147 136
Income taxes payable—current 129 149
Income taxes payable—noncurrent 17 22
Total income taxes payable $ 146 $ 171