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Financial Instruments, Derivatives and Fair Value Measures - Carrying Value and Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Fair value, asset and liability measures    
Long-term Investments $ 812 $ 821
Equity securities    
Fair value, asset and liability measures    
Long-term Investments 758 776
Carrying value    
Fair value, asset and liability measures    
Total Long-Term debt (18,200) (18,534)
Foreign currency forward exchange contracts, receivable position 238 90
Foreign currency forward exchange contracts, (payable) position (137) (498)
Interest rate hedge contracts, receivable position 129 210
Carrying value | Equity securities    
Fair value, asset and liability measures    
Long-term Investments 758 776
Carrying value | Other    
Fair value, asset and liability measures    
Long-term Investments 54 45
Fair value    
Fair value, asset and liability measures    
Total Long-Term debt (21,330) (22,809)
Foreign currency forward exchange contracts, receivable position 238 90
Foreign currency forward exchange contracts, (payable) position (137) (498)
Interest rate hedge contracts, receivable position 129 210
Fair value | Equity securities    
Fair value, asset and liability measures    
Long-term Investments 758 776
Fair value | Other    
Fair value, asset and liability measures    
Long-term Investments $ 54 $ 45