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Financial Instruments - Non-U.S. Dollar Debt Designated as Net Investment Hedges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Euro notes      
Derivative Instruments, Gain (Loss) [Line Items]      
After-tax gains/(losses) related to hedges of net investments in international operations $ (81) $ 162 $ 211
British pound sterling notes      
Derivative Instruments, Gain (Loss) [Line Items]      
After-tax gains/(losses) related to hedges of net investments in international operations 0 45 3
Swiss franc notes      
Derivative Instruments, Gain (Loss) [Line Items]      
After-tax gains/(losses) related to hedges of net investments in international operations (41) 13 29
Canadian notes      
Derivative Instruments, Gain (Loss) [Line Items]      
After-tax gains/(losses) related to hedges of net investments in international operations $ (8) $ 25 $ (3)