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Financial Instruments, Derivatives and Hedging Activities - FV (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Carrying value    
Fair value of assets and liabilities    
Long-term debt $ 2,000  
Fair value    
Fair value of assets and liabilities    
Long-term debt 2,000  
Fair Value, Measurements, Recurring    
Fair value of assets and liabilities    
Available for sale securities 10 $ 11
Derivative assets 12 24
Derivative liabilities 29 26
Long-term debt 1,969 1,954
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fair value of assets and liabilities    
Available for sale securities 10 11
Derivative assets 1 4
Derivative liabilities 14 6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair value of assets and liabilities    
Derivative assets 11 20
Derivative liabilities 15 20
Long-term debt $ 1,969 $ 1,954