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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions
As of June 30, 2016 and December 31, 2015, the net forward notional buy (sell) position of our outstanding commodity and interest rate hedging instruments that did not qualify or were not designated under the normal purchase normal sale exemption were as follows (in millions):
Derivative Instruments
 
Notional Amounts
 
June 30, 2016
 
December 31, 2015
Power (MWh)
 
(48
)
 
(41
)
Natural gas (MMBtu)
 
1,038

 
996

Environmental credits (Tonnes)
 
18

 
8

Interest rate hedging instruments
 
$
3,798

(1) 
$
1,320


___________
(1)
We entered into interest rate hedging instruments during the second quarter of 2016 to hedge approximately $2.5 billion of variable rate corporate debt for 2017 through 2019 which effectively places a ceiling on LIBOR at rates varying from 1.44% to 1.8125% for hedged interest payments. See Note 4 for a further discussion of our First Lien Term Loans.
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
The following tables present the fair values of our derivative instruments recorded on our Consolidated Condensed Balance Sheets by location and hedge type at June 30, 2016 and December 31, 2015 (in millions):
 
June 30, 2016
  
Commodity
Instruments
 
Interest Rate
Hedging Instruments
 
Total
Derivative
Instruments
Balance Sheet Presentation
 
 
 
 
 
Current derivative assets
$
1,231

 
$
—

 
$
1,231

Long-term derivative assets
360

 
9

 
369

Total derivative assets
$
1,591

 
$
9

 
$
1,600

 
 
 
 
 
 
Current derivative liabilities
$
1,323

 
$
37

 
$
1,360

Long-term derivative liabilities
453

 
59

 
512

Total derivative liabilities
$
1,776

 
$
96

 
$
1,872

Net derivative assets (liabilities)
$
(185
)
 
$
(87
)
 
$
(272
)

 
December 31, 2015
 
Commodity
Instruments
 
Interest Rate
Hedging Instruments
 
Total
Derivative
Instruments
Balance Sheet Presentation
 
 
 
 
 
Current derivative assets
$
1,698

 
$
—

 
$
1,698

Long-term derivative assets
312

 
1

 
313

Total derivative assets
$
2,010

 
$
1

 
$
2,011

 
 
 
 
 
 
Current derivative liabilities
$
1,697

 
$
37

 
$
1,734

Long-term derivative liabilities
420

 
53

 
473

Total derivative liabilities
$
2,117

 
$
90

 
$
2,207

Net derivative assets (liabilities)
$
(107
)
 
$
(89
)
 
$
(196
)
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
 
June 30, 2016
 
December 31, 2015
 
Fair Value
of Derivative
Assets
 
Fair Value
of Derivative
Liabilities
 
Fair Value
of Derivative
Assets
 
Fair Value
of Derivative
Liabilities
Derivatives designated as cash flow hedging instruments:
 
 
 
 
 
 
 
Interest rate hedging instruments
$
9

 
$
96

 
$
1

 
$
90

Total derivatives designated as cash flow hedging instruments
$
9

 
$
96

 
$
1

 
$
90

 
 
 
 
 
 
 
 
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
 
Commodity instruments
$
1,591

 
$
1,776

 
$
2,010

 
$
2,117

Total derivatives not designated as hedging instruments
$
1,591

 
$
1,776

 
$
2,010

 
$
2,117

Total derivatives
$
1,600

 
$
1,872

 
$
2,011

 
$
2,207
Derivative Instruments Subject to Master Netting Arrangements [Table Text Block]
The tables below set forth our net exposure to derivative instruments after offsetting amounts subject to a master netting arrangement with the same counterparty at June 30, 2016 and December 31, 2015 (in millions):
 
 
June 30, 2016
 
 
Gross Amounts Not Offset on the Consolidated Condensed Balance Sheets
 
 
Gross Amounts Presented on our Consolidated Condensed Balance Sheets
 
Derivative Asset (Liability) not Offset on the Consolidated Condensed Balance Sheets
 
Margin/Cash (Received) Posted (1)
 
Net Amount
Derivative assets:
 
 
 
 
 
 
 
 
Commodity exchange traded futures and swaps contracts
 
$
1,316

 
$
(1,237
)
 
$
(79
)
 
$
—

Commodity forward contracts
 
275

 
(232
)
 
(2
)
 
41

Interest rate hedging instruments
 
9

 
—

 
—

 
9

Total derivative assets
 
$
1,600

 
$
(1,469
)
 
$
(81
)
 
$
50

Derivative (liabilities):
 
 
 
 
 
 
 
 
Commodity exchange traded futures and swaps contracts
 
$
(1,248
)
 
$
1,237

 
$
11

 
$
—

Commodity forward contracts
 
(528
)
 
232

 
12

 
(284
)
Interest rate hedging instruments
 
(96
)
 
—

 
—

 
(96
)
Total derivative (liabilities)
 
$
(1,872
)
 
$
1,469

 
$
23

 
$
(380
)
Net derivative assets (liabilities)
 
$
(272
)
 
$
—

 
$
(58
)
 
$
(330
)
 
 
December 31, 2015
 
 
Gross Amounts Not Offset on the Consolidated Condensed Balance Sheets
 
 
Gross Amounts Presented on our Consolidated Condensed Balance Sheets
 
Derivative Asset (Liability) not Offset on the Consolidated Condensed Balance Sheets
 
Margin/Cash (Received) Posted (1)
 
Net Amount
Derivative assets:
 
 
 
 
 
 
 
 
Commodity exchange traded futures and swaps contracts
 
$
1,736

 
$
(1,602
)
 
$
(134
)
 
$
—

Commodity forward contracts
 
274

 
(202
)
 
(3
)
 
69

Interest rate hedging instruments
 
1

 
—

 
—

 
1

Total derivative assets
 
$
2,011

 
$
(1,804
)
 
$
(137
)
 
$
70

Derivative (liabilities):
 
 
 
 
 
 
 
 
Commodity exchange traded futures and swaps contracts
 
$
(1,604
)
 
$
1,602

 
$
2

 
$
—

Commodity forward contracts
 
(513
)
 
202

 
3

 
(308
)
Interest rate hedging instruments
 
(90
)
 
—

 
—

 
(90
)
Total derivative (liabilities)
 
$
(2,207
)
 
$
1,804

 
$
5

 
$
(398
)
Net derivative assets (liabilities)
 
$
(196
)
 
$
—

 
$
(132
)
 
$
(328
)
____________
(1)
Negative balances represent margin deposits posted with us by our counterparties related to our derivative activities that are subject to a master netting arrangement. Positive balances reflect margin deposits and natural gas and power prepayments posted by us with our counterparties related to our derivative activities that are subject to a master netting arrangement. See Note 7 for a further discussion of our collateral.
Realized Unrealized Gain Loss by Instrument
The following tables detail the components of our total activity for both the net realized gain (loss) and the net mark-to-market gain (loss) recognized from our derivative instruments in earnings and where these components were recorded on our Consolidated Condensed Statements of Operations for the periods indicated (in millions):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Realized gain (loss)(1)(2)
 
 
 
 
 
 
 
Commodity derivative instruments
$
63

 
$
104

 
$
181

 
$
163

Total realized gain (loss)
$
63

 
$
104

 
$
181

 
$
163

 
 
 
 
 
 
 
 
Mark-to-market gain (loss)(3)
 
 
 
 
 
 
 
Commodity derivative instruments
$
(36
)
 
$
(1
)
 
$
(131
)
 
$
69

Interest rate hedging instruments
—

 
—

 
1

 
1

Total mark-to-market gain (loss)
$
(36
)
 
$
(1
)
 
$
(130
)
 
$
70

Total activity, net
$
27

 
$
103

 
$
51

 
$
233

___________
(1)
Does not include the realized value associated with derivative instruments that settle through physical delivery.
(2)
Includes amortization of acquisition date fair value of derivative activity related to the acquisition of Champion Energy.
(3)
In addition to changes in market value on derivatives not designated as hedges, changes in mark-to-market gain (loss) also includes hedge ineffectiveness and adjustments to reflect changes in credit default risk exposure.
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Realized and mark-to-market gain (loss)
 
 
 
 
 
 
 
Derivatives contracts included in operating revenues(1)(2)
$
(272
)
 
$
115

 
$
(68
)
 
$
234

Derivatives contracts included in fuel and purchased energy expense(1)(2)
299

 
(12
)
 
118

 
(2
)
Interest rate hedging instruments included in interest expense(3)
—

 
—

 
1

 
1

Total activity, net
$
27

 
$
103

 
$
51

 
$
233


___________
(1)
Does not include the realized value associated with derivative instruments that settle through physical delivery.
(2)
Includes amortization of acquisition date fair value of derivative activity related to the acquisition of Champion Energy.
(3)
In addition to changes in market value on derivatives not designated as hedges, changes in mark-to-market gain (loss) also includes hedge ineffectiveness and adjustments to reflect changes in credit default risk exposure.
Derivatives Designated as Hedges
The following table details the effect of our net derivative instruments that qualified for hedge accounting treatment and are included in OCI and AOCI for the periods indicated (in millions):
 
Three Months Ended June 30,
 
Three Months Ended June 30,
 
Gain (Loss) Recognized in
OCI (Effective Portion)
 
Gain (Loss) Reclassified from
AOCI into Income (Effective Portion)(3)
 
2016
 
2015
 
2016
 
2015
 
Affected Line Item on the Consolidated Condensed Statements of Operations
Interest rate hedging instruments(1)(2)
$
(6
)
 
$
14

 
$
(11
)
 
$
(12
)
 
Interest expense
 
Six Months Ended June 30,
 
Six Months Ended June 30,
 
Gain (Loss) Recognized in
OCI (Effective Portion)
 
Gain (Loss) Reclassified from
AOCI into Income (Effective Portion)(3)
 
2016
 
2015
 
2016
 
2015
 
Affected Line Item on the Consolidated Condensed Statements of Operations
Interest rate hedging instruments(1)(2)
$
(18
)
 
$
8

 
$
(22
)
 
$
(24
)
 
Interest expense
____________
(1)
We did not record any material gain (loss) on hedge ineffectiveness related to our interest rate hedging instruments designated as cash flow hedges during the three and six months ended June 30, 2016 and 2015.
(2)
We recorded an income tax expense of nil for each of the three and six months ended June 30, 2016 and 2015, 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 $143 million and $127 million at June 30, 2016 and December 31, 2015, respectively. Cumulative cash flow hedge losses attributable to the noncontrolling interest, net of tax, remaining in AOCI were $13 million and $11 million at June 30, 2016 and December 31, 2015, respectively.