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Financial Instruments - Hedges of Net Investments in International Operations (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Euro notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations $ 18 $ (83) $ 94 $ (279)
British pound sterling notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations 5 (8) 13 (23)
Swiss franc notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations (10) 12 6 (53)
Canadian dollar notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations $ (6) $ 0 $ (2) $ 0