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Financial Instruments, Derivatives and Fair Value Measures - Carrying Value and Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Fair value, asset and liability measures    
Long-term Investments $ 803 $ 883
Equity securities    
Fair value, asset and liability measures    
Long-term Investments 755 836
Carrying Value    
Fair value, asset and liability measures    
Total Long-Term Debt (18,355) (17,938)
Foreign currency forward exchange contracts, receivable position 126 148
Foreign currency forward exchange contracts, (payable) position (303) (89)
Interest rate hedge contracts, receivable position 232 48
Carrying Value | Equity securities    
Fair value, asset and liability measures    
Long-term Investments 755 836
Carrying Value | Other    
Fair value, asset and liability measures    
Long-term Investments 48 47
Fair Value    
Fair value, asset and liability measures    
Total Long-Term Debt (22,224) (20,772)
Foreign currency forward exchange contracts, receivable position 126 148
Foreign currency forward exchange contracts, (payable) position (303) (89)
Interest rate hedge contracts, receivable position 232 48
Fair Value | Equity securities    
Fair value, asset and liability measures    
Long-term Investments 755 836
Fair Value | Other    
Fair value, asset and liability measures    
Long-term Investments $ 48 $ 47