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Financial Instruments - Hedges of Net Investments in International Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Euro notes      
Derivative Instruments, Gain (Loss) [Line Items]      
After-tax gains/(losses) related to hedges of net investments in international operations $ 126 $ (323) $ 73
British pound sterling notes      
Derivative Instruments, Gain (Loss) [Line Items]      
After-tax gains/(losses) related to hedges of net investments in international operations 19 (26) 148
Swiss franc notes      
Derivative Instruments, Gain (Loss) [Line Items]      
After-tax gains/(losses) related to hedges of net investments in international operations 7 (49) 12
Canadian dollar notes      
Derivative Instruments, Gain (Loss) [Line Items]      
After-tax gains/(losses) related to hedges of net investments in international operations $ 17 $ 0 $ 0