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Financial Instruments Non-Derivative Financial Instruments Designated as Hedging (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Debt designated as net investment in foreign operations $ 890 $ 890
Gain (loss) recognized in AOCI $ (25) $ (71)