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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Euro notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations $ 82 $ 165 $ 32 $ 381
British pound sterling notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations 0 20 0 47
Swiss franc notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations 11 23 (5) 50
Canadian notes        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) related to hedges of net investments in international operations $ 9 $ 24 $ 1 $ 31