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Accounting for Derivative Instruments and Hedging Activities - FV of Derivatives (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Derivative assets   $ 11
Derivative liabilities $ 92 21
Derivatives Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets   5
Derivative liabilities 14 7
Derivatives Not Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets   6
Derivative liabilities 78 14
Interest rate contracts current | Derivatives Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets   2
Derivative liabilities 3 1
Interest rate contracts current | Derivatives Not Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets   1
Derivative liabilities 13 3
Interest rate contracts long-term | Derivatives Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets   3
Derivative liabilities 11 6
Interest rate contracts long-term | Derivatives Not Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets   5
Derivative liabilities 56 11
Commodity contracts long-term | Derivatives Not Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets   0
Derivative liabilities $ 9 $ 0