v3.8.0.1
Derivative Instruments (Details 2) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Derivative Asset [1] $ 490 $ 521
Derivative Liability [1] 216 287
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 11 29
Derivative Liability 43 58
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 479 492
Derivative Liability 173 229
Interest Rate Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative Asset 20 29
Derivative Liability 52 58
Interest Rate Hedging Instruments | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 11 29
Derivative Liability 43 58
Energy Related Derivative [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 479 492
Derivative Liability $ 173 $ 229
[1] At September 30, 2017 and December 31, 2016, we had $115 million and $262 million of collateral under master netting arrangements that were not offset against our derivative instruments on the Consolidated Condensed Balance Sheets.