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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2015
Derivative Instruments [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions
As of June 30, 2015 and December 31, 2014, the net forward notional buy (sell) position of our outstanding commodity and interest rate swap contracts 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, 2015
 
December 31, 2014
Power (MWh)
 
(99
)
 
(62
)
Natural gas (MMBtu)
 
874

 
291

Environmental credits (Tonnes)
 
3

 
—

Interest rate swaps
 
$
1,411

 
$
1,431
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, 2015 and December 31, 2014 (in millions):
 
June 30, 2015
  
Commodity
Instruments
 
Interest Rate
Swaps
 
Total
Derivative
Instruments
Balance Sheet Presentation
 
 
 
 
 
Current derivative assets
$
1,607

 
$
—

 
$
1,607

Long-term derivative assets
634

 
3

 
637

Total derivative assets
$
2,241

 
$
3

 
$
2,244

 
 
 
 
 
 
Current derivative liabilities
$
1,365

 
$
42

 
$
1,407

Long-term derivative liabilities
390

 
63

 
453

Total derivative liabilities
$
1,755

 
$
105

 
$
1,860

Net derivative asset (liabilities)
$
486

 
$
(102
)
 
$
384


 
December 31, 2014
 
Commodity
Instruments
 
Interest Rate
Swaps
 
Total
Derivative
Instruments
Balance Sheet Presentation
 
 
 
 
 
Current derivative assets
$
2,058

 
$
—

 
$
2,058

Long-term derivative assets
435

 
4

 
439

Total derivative assets
$
2,493

 
$
4

 
$
2,497

 
 
 
 
 
 
Current derivative liabilities
$
1,738

 
$
44

 
$
1,782

Long-term derivative liabilities
374

 
70

 
444

Total derivative liabilities
$
2,112

 
$
114

 
$
2,226

Net derivative asset (liabilities)
$
381

 
$
(110
)
 
$
271
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
 
June 30, 2015
 
December 31, 2014
 
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 swaps
$
3

 
$
105

 
$
4

 
$
112

Total derivatives designated as cash flow hedging instruments
$
3

 
$
105

 
$
4

 
$
112

 
 
 
 
 
 
 
 
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
 
Commodity instruments
$
2,241

 
$
1,755

 
$
2,493

 
$
2,112

Interest rate swaps
—

 
—

 
—

 
2

Total derivatives not designated as hedging instruments
$
2,241

 
$
1,755

 
$
2,493

 
$
2,114

Total derivatives
$
2,244

 
$
1,860

 
$
2,497

 
$
2,226
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, 2015 and December 31, 2014 (in millions):
 
 
June 30, 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
 
$
1,684

 
$
(1,506
)
 
$
(178
)
 
$
—

Commodity forward contracts
 
557

 
(231
)
 
(9
)
 
317

Interest rate swaps
 
3

 
—

 
—

 
3

Total derivative assets
 
$
2,244

 
$
(1,737
)
 
$
(187
)
 
$
320

Derivative (liabilities):
 
 
 
 
 
 
 
 
Commodity exchange traded futures and swaps contracts
 
$
(1,506
)
 
$
1,506

 
$
—

 
$
—

Commodity forward contracts
 
(249
)
 
231

 
9

 
(9
)
Interest rate swaps
 
(105
)
 
—

 
—

 
(105
)
Total derivative (liabilities)
 
$
(1,860
)
 
$
1,737

 
$
9

 
$
(114
)
Net derivative assets (liabilities)
 
$
384

 
$
—

 
$
(178
)
 
$
206

 
 
December 31, 2014
 
 
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
 
$
2,134

 
$
(1,865
)
 
$
(269
)
 
$
—

Commodity forward contracts
 
359

 
(222
)
 
—

 
137

Interest rate swaps
 
4

 
—

 
—

 
4

Total derivative assets
 
$
2,497

 
$
(2,087
)
 
$
(269
)
 
$
141

Derivative (liabilities):
 
 
 
 
 
 
 
 
Commodity exchange traded futures and swaps contracts
 
$
(1,870
)
 
$
1,865

 
$
5

 
$
—

Commodity forward contracts
 
(242
)
 
222

 
10

 
(10
)
Interest rate swaps
 
(114
)
 
—

 
—

 
(114
)
Total derivative (liabilities)
 
$
(2,226
)
 
$
2,087

 
$
15

 
$
(124
)
Net derivative assets (liabilities)
 
$
271

 
$
—

 
$
(254
)
 
$
17

____________
(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,
 
2015
 
2014
 
2015
 
2014
Realized gain (loss)(1)
 
 
 
 
 
 
 
Commodity derivative instruments
$
104

 
$
18

 
$
163

 
$
(21
)
Total realized gain (loss)
$
104

 
$
18

 
$
163

 
$
(21
)
 
 
 
 
 
 
 
 
Mark-to-market gain (loss)(2)
 
 
 
 
 
 
 
Commodity derivative instruments
$
(1
)
 
$
141

 
$
69

 
$
68

Interest rate swaps
—

 
1

 
1

 
2

Total mark-to-market gain (loss)
$
(1
)
 
$
142

 
$
70

 
$
70

Total activity, net
$
103

 
$
160

 
$
233

 
$
49

___________
(1)
Does not include the realized value associated with derivative instruments that settle through physical delivery.
(2)
In addition to changes in market value on derivatives not designated as hedges, changes in mark-to-market gain (loss) also includes de-designation of interest rate swap cash flow hedges and related reclassification from AOCI into earnings, 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,
 
2015
 
2014
 
2015
 
2014
Realized and mark-to-market gain (loss)
 
 
 
 
 
 
 
Derivatives contracts included in operating revenues
$
115

 
$
158

 
$
234

 
$
(79
)
Derivatives contracts included in fuel and purchased energy expense
(12
)
 
1

 
(2
)
 
126

Interest rate swaps included in interest expense
—

 
1

 
1

 
2

Total activity, net
$
103

 
$
160

 
$
233

 
$
49
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)(4)
 
2015
 
2014
 
2015
 
2014
 
Affected Line Item on the Consolidated Condensed Statements of Operations
Interest rate swaps(1)(2)
$
14

 
$
(9
)
 
$
(12
)
 
$
(13
)
 
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)(4)
 
2015
 
2014
 
2015
 
2014
 
Affected Line Item on the Consolidated Condensed Statements of Operations
Interest rate swaps(1)(2)
$
8

 
$
(9
)
 
$
(24
)
 
$
(26
)
 
Interest expense
____________
(1)
We did not record any gain (loss) on hedge ineffectiveness related to our interest rate swaps designated as cash flow hedges during the three and six months ended June 30, 2015 and 2014.
(2)
We recorded an income tax expense of nil for each of the three and six months ended June 30, 2015 and 2014, 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 $142 million and $149 million at June 30, 2015 and December 31, 2014, respectively. Cumulative cash flow hedge losses attributable to the noncontrolling interest, net of tax, remaining in AOCI were $11 million and $12 million at June 30, 2015 and December 31, 2014, respectively.
(4)
Includes a loss of $5 million and $10 million for the three and six months ended June 30, 2014, respectively, that was reclassified from AOCI to interest expense, where the hedged transactions are no longer expected to occur.