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Derivative and Other Financial Instruments (Offsetting of Derivative Assets and Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross Amounts Recognized in the Balance Sheet, Derivative Assets $ 48 $ 45
Gross Amounts Not Offset in the Balance Sheet, Derivative Assets 9 6
Net Amount, Derivative Assets 39 39
Gross Amounts Recognized in the Balance Sheet, Derivative Liabilities 26 37
Gross Amounts Not Offset in the Balance Sheet, Derivative Liabilities 9 6
Net Amount, Derivative Liabilities $ 17 $ 31