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Derivative Instruments (Details 4) (Details) (Interest Rate Swap [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Interest Rate Swap [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (Loss) Recognized in OCI (Effective Portion) $ 11 [1],[2] $ 12 [1],[2] $ 2 [1],[2] $ 73 [1],[2]
Gain (Loss) Reclassified from AOCI into Income (EffectivePortion) $ (8) [1],[2],[3],[4] $ (19) [1],[2],[3] $ (34) [1],[2],[3],[4] $ (38) [1],[2],[3]
[1] We did not record any gain (loss) on hedge ineffectiveness related to our interest rate swaps designated as cash flow hedges during each of the three and nine months ended September 30, 2014 and 2013.
[2] We recorded an income tax expense of nil and $7 million for the three months ended September 30, 2014 and 2013, respectively, and income tax expense of nil and $4 million for the nine months ended September 30, 2014 and 2013, respectively, in AOCI related to our cash flow hedging activities.
[3] Cumulative cash flow hedge losses attributable to Calpine, net of tax, remaining in AOCI were $145 million and $148 million at September 30, 2014 and December 31, 2013, respectively. Cumulative cash flow hedge losses attributable to the noncontrolling interest, net of tax, remaining in AOCI were $12 million and $11 million at September 30, 2014 and December 31, 2013, respectively.
[4] Includes a loss of nil and $7 million for the three months ended September 30, 2014 and 2013, respectively, and a loss of $10 million and $7 million for the nine months ended September 30, 2014 and 2013, respectively, that was reclassified from AOCI to interest expense, where the hedged transactions are no longer expected to occur.