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Financial Instruments, Derivatives and Hedging Activities - FV (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fair value of assets and liabilities    
Long-term debt, noncurrent, Fair Value $ 1,751 $ 1,751
Carrying value    
Fair value of assets and liabilities    
Long-term debt, noncurrent, Fair Value 1,800  
Fair Value, Measurements, Recurring    
Fair value of assets and liabilities    
Available for sale securities 11 13
Derivative assets 69 24
Derivative liabilities 29 36
Long-term debt, noncurrent, Fair Value 1,751 1,751
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fair value of assets and liabilities    
Available for sale securities 11 13
Derivative assets 53 7
Derivative liabilities 3 5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair value of assets and liabilities    
Derivative assets 16 17
Derivative liabilities 26 31
Long-term debt, noncurrent, Fair Value $ 1,751 $ 1,751