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Financial Instruments, Derivatives and Hedging Activities - FV (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair value of assets and liabilities    
Long-term debt $ 1,751 $ 1,954
Fair Value, Measurements, Recurring    
Fair value of assets and liabilities    
Available for sale securities 13 11
Derivative assets 24 24
Derivative liabilities 36 26
Long-term debt 1,751 1,954
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fair value of assets and liabilities    
Available for sale securities 13 11
Derivative assets 7 4
Derivative liabilities 5 6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair value of assets and liabilities    
Derivative assets 17 20
Derivative liabilities 31 20
Long-term debt $ 1,751 $ 1,954