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Derivative Instruments (Details 4) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Derivatives included in OCI and AOCI [Line Items]    
Gain (loss) recognized in OCI (effective portion)$ (94)$ 53$ (36)$ 105
Gain (loss) reclassified from AOCI into income (effective portion)2012(24)(10)
Gain (loss) reclassified from AOCI into income (ineffective portion)(2)(1)(2) 
Interest Rate Swaps
    
Derivatives included in OCI and AOCI [Line Items]    
Gain (loss) recognized in OCI (effective portion)98(27)87
Gain (loss) reclassified from AOCI into income (effective portion)2762106[1]162
Gain (loss) reclassified from AOCI into income (ineffective portion)(1)(1)  
Commodity instruments
    
Derivatives included in OCI and AOCI [Line Items]    
Gain (loss) recognized in OCI (effective portion)(103)45(9)18
Gain (loss) reclassified from AOCI into income (effective portion)(7)(50)(130)[2](172)
Gain (loss) reclassified from AOCI into income (ineffective portion)$ (1) $ (2) 
[1]

Included in operating revenues and fuel and purchased energy expense on our Consolidated Condensed Statements of Operations.

[2]

Reclassification of losses from OCI to earnings for the nine months ended September 30, 2011 consisted of $24 million in losses from the reclassification of interest rate contracts due to settlement, $15 million in losses from terminated interest rate contracts due to the repayment of project debt in June 2011, and $91 million in losses from existing interest rate contracts reclassified from OCI into earnings due to the refinance of variable rate First Lien Credit Facility term loans.