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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Euro notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations $ (36) $ 151 $ 22 $ 76
British pound sterling notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations 7 21 1 8
Swiss franc notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations (21) 42 (8) 16
Canadian dollar notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations $ (7) $ 6 $ (14) $ 4