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Financial Instruments (Derivative) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Cash and Cash Equivalents [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 4,667 $ 4,245 $ 330 $ 177
Credit Derivative, Maximum Exposure, Undiscounted 64      
Bank Time Deposits [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 1,600 $ 64