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Financial Instruments, Derivatives and Hedging Activities - FV (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Carrying value    
Fair value of assets and liabilities    
Long-term debt $ 2,100  
Fair Value, Measurements, Recurring    
Fair value of assets and liabilities    
Available for sale securities 10 $ 13
Derivative assets 32 24
Derivative liabilities 37 36
Long-term debt 2,106 1,751
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fair value of assets and liabilities    
Available for sale securities 10 13
Derivative assets 15 7
Derivative liabilities 5 5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair value of assets and liabilities    
Derivative assets 17 17
Derivative liabilities 32 31
Long-term debt $ 2,106 $ 1,751