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Financial Instruments - Hedges of Net Investments in International Operations (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Euro notes    
Derivative Instruments, Gain (Loss) [Line Items]    
After-tax gains/(losses) related to hedges of net investments in international operations $ (75) $ (29)
British pound sterling notes    
Derivative Instruments, Gain (Loss) [Line Items]    
After-tax gains/(losses) related to hedges of net investments in international operations (13) (5)
Swiss franc notes    
Derivative Instruments, Gain (Loss) [Line Items]    
After-tax gains/(losses) related to hedges of net investments in international operations (26) (15)
Canadian dollar notes    
Derivative Instruments, Gain (Loss) [Line Items]    
After-tax gains/(losses) related to hedges of net investments in international operations $ (2) $ 0