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Financial Instruments - Non-U.S. Dollar Debt Designated as Net Investment Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Euro notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations $ (122) $ 111 $ (135) $ 133
British pound sterling notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations (10) 8 7 9
Swiss franc notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations (27) 24 (47) 16
Canadian notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations $ (6) $ 4 $ 9 $ (10)