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Financial Instruments Non-Derivative Financial Instruments Designated as Hedging (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]          
Debt designated as net investment in foreign operations $ 845   $ 845   $ 884
Gain (loss) recognized in AOCI $ 1 $ (60) $ (23) $ (46)