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Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities - FV of Derivatives (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] $ 35 $ 2
Derivative Liability, Fair Value, Gross Liability 14 49
Fair Value of Gross Derivative Assets/(Liabilities), Net 21 (47)
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset 0 0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral 21 (47)
Derivative, Collateral, Right to Reclaim Cash 0 0
Derivative, Collateral, Obligation to Return Cash 0 0
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 13 1
Derivative Liability, Fair Value, Gross Liability 5 13
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 22 1
Derivative Liability, Fair Value, Gross Liability 9 36
Interest Rate Contract Current [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 2 0
Derivative Liability, Fair Value, Gross Liability 1 4
Interest Rate Contract Current [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 1 0
Derivative Liability, Fair Value, Gross Liability 3 13
Interest Rate Contract Non Current [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 11 1
Derivative Liability, Fair Value, Gross Liability 4 9
Interest Rate Contract Non Current [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 21 0
Derivative Liability, Fair Value, Gross Liability 5 22
Commodity Contract Current [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1]   1
Derivative Liability, Fair Value, Gross Liability 1 1
Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   1
Derivative Liability, Fair Value, Gross Liability 1 [2] 1
Derivative Asset, Fair Value, Gross Liability   0
Derivative Liability, Fair Value, Gross Asset 0 [2] 0
Derivative Asset   1
Derivative Liability 1 [2] 1
Fair Value of Gross Derivative Assets/(Liabilities), Net (1) [2] 0
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset 0 [2] 0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral (1) [2] 0
Interest Rate Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 35 1
Derivative Liability, Fair Value, Gross Liability 13 48
Derivative Asset, Fair Value, Gross Liability 2 1
Derivative Liability, Fair Value, Gross Asset 2 1
Derivative Asset 33 0
Derivative Liability 11 47
Fair Value of Gross Derivative Assets/(Liabilities), Net 22 (47)
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset 0 0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral 22 (47)
Interest [Member] | United States of America, Dollars    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,909 2,050
Natural Gas [Member] | MMbtu [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 2 $ 2
[1] Derivative Assets balances classified as current are included within the prepayments and other current assets line item of the consolidated balance sheets as of September 30, 2018 and December 31, 2017.
[2] There were no commodity contracts classified as derivative assets as of September 30, 2018.