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Financial Instruments - Hedges of Net Investments in International Operations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Euro notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations $ 151 $ (168) $ 76 $ (196)
British pound sterling notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations 21 (10) 8 (15)
Swiss franc notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations 42 (49) 16 (64)
Canadian dollar notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations $ 6 $ 0 $ 4 $ 0