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Derivative Instruments (Details 4) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (Loss) Recognized in OCI (Effective Portion) $ 0 [1] $ 13 [1]
Gain (Loss) Reclassified from AOCI into Income (EffectivePortion) (13) [1],[2] (9) [1],[2]
Interest Rate Swap [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (Loss) Recognized in OCI (Effective Portion) 0 [3] 13 [3]
Gain (Loss) Reclassified from AOCI into Income (EffectivePortion) $ (13) [2],[3],[4] $ (9) [2],[3]
[1] We recorded an income tax benefit of nil and $1 million for the three months ended March 31, 2014 and 2013, respectively, in AOCI related to our cash flow hedging activities.
[2] Cumulative cash flow hedge losses attributable to Calpine, net of tax, remaining in AOCI were $148 million at each of March 31, 2014 and December 31, 2013. Cumulative cash flow hedge losses attributable to the noncontrolling interest, net of tax, remaining in AOCI were $11 million at each of March 31, 2014 and December 31, 2013.
[3] We did not record any gain (loss) on hedge ineffectiveness related to our interest rate swaps designated as cash flow hedges during the three months ended March 31, 2014 and 2013.
[4] Includes a loss of $5 million that was reclassified from AOCI to interest expense for the three months ended March 31, 2014 where the hedged transactions are no longer expected to occur.