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Financial Instruments, Derivatives and Fair Value Measures - Carrying Value and Fair Value (Details)K - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fair value, asset and liability measures    
Long-term Investments $ 821 $ 883
Foreign currency forward exchange contracts, receivable position 300 196
Foreign currency forward exchange contracts, (payable) position (1,075) (635)
Equity securities    
Fair value, asset and liability measures    
Long-term Investments 776 836
Carrying Value    
Fair value, asset and liability measures    
Total Long-Term debt (18,534) (17,938)
Foreign currency forward exchange contracts, receivable position 90 148
Foreign currency forward exchange contracts, (payable) position (498) (89)
Interest rate hedge contracts, receivable position 210 48
Carrying Value | Equity securities    
Fair value, asset and liability measures    
Long-term Investments 776 836
Carrying Value | Other    
Fair value, asset and liability measures    
Long-term Investments 45 47
Fair Value    
Fair value, asset and liability measures    
Total Long-Term debt (22,809) (20,772)
Foreign currency forward exchange contracts, receivable position 90 148
Foreign currency forward exchange contracts, (payable) position (498) (89)
Interest rate hedge contracts, receivable position 210 48
Fair Value | Equity securities    
Fair value, asset and liability measures    
Long-term Investments 776 836
Fair Value | Other    
Fair value, asset and liability measures    
Long-term Investments $ 45 $ 47