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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions
As of December 31, 2018 and 2017, the net forward notional buy (sell) position of our outstanding commodity derivative instruments that did not qualify or were not designated under the normal purchase normal sale exemption and our interest rate hedging instruments were as follows (in millions):
Derivative Instruments
 
Notional Amounts
 
2018
 
2017
Power (MWh)
 
(161
)
 
(119
)
Natural gas (MMBtu)
 
1,045

 
405

Environmental credits (Tonnes)
 
13

 
12

Interest rate hedging instruments
 
$
4,500

 
$
4,600
Offsetting Assets
The following tables present the fair values of our derivative instruments and our net exposure after offsetting amounts subject to a master netting arrangement with the same counterparty to our derivative instruments recorded on our Consolidated Balance Sheets by location and hedge type at December 31, 2018 and 2017 (in millions):
 
 
December 31, 2018
 
 
Gross Amounts of Assets and (Liabilities)
 
Gross Amounts Offset on the Consolidated Balance Sheets
 
Net Amount Presented on the Consolidated Balance Sheets(1)
Derivative assets:
 
 
 
 
 
 
Commodity exchange traded derivatives contracts
 
$
820

 
$
(820
)
 
$
—

Commodity forward contracts
 
341

 
(229
)
 
112

Interest rate hedging instruments
 
30

 
—

 
30

Total current derivative assets(2)
 
$
1,191

 
$
(1,049
)
 
$
142

Commodity exchange traded derivatives contracts
 
113

 
(113
)
 
—

Commodity forward contracts
 
209

 
(59
)
 
150

Interest rate hedging instruments
 
10

 
—

 
10

Total long-term derivative assets(2)
 
$
332

 
$
(172
)
 
$
160

Total derivative assets
 
$
1,523

 
$
(1,221
)
 
$
302

 
 
 
 
 
 
 
Derivative (liabilities):
 
 
 
 
 
 
Commodity exchange traded derivatives contracts
 
$
(764
)
 
$
764

 
$
—

Commodity forward contracts
 
(576
)
 
277

 
(299
)
Interest rate hedging instruments
 
(4
)
 
—

 
(4
)
Total current derivative (liabilities)(2)
 
$
(1,344
)
 
$
1,041

 
$
(303
)
Commodity exchange traded derivatives contracts
 
(168
)
 
168

 
—

Commodity forward contracts
 
(193
)
 
59

 
(134
)
Interest rate hedging instruments
 
(6
)
 
—

 
(6
)
Total long-term derivative (liabilities)(2)
 
$
(367
)
 
$
227

 
$
(140
)
Total derivative liabilities
 
$
(1,711
)
 
$
1,268

 
$
(443
)
Net derivative assets (liabilities)
 
$
(188
)
 
$
47

 
$
(141
)
 
 
December 31, 2017
 
 
Gross Amounts of Assets and (Liabilities)
 
Gross Amounts Offset on the Consolidated Balance Sheets
 
Net Amount Presented on the Consolidated Balance Sheets(1)
Derivative assets:
 
 
 
 
 
 
Commodity exchange traded derivatives contracts
 
$
672

 
$
(672
)
 
$
—

Commodity forward contracts
 
361

 
(194
)
 
167

Interest rate hedging instruments
 
7

 
—

 
7

Total current derivative assets(3)
 
$
1,040

 
$
(866
)
 
$
174

Commodity exchange traded derivatives contracts
 
74

 
(74
)
 
—

Commodity forward contracts
 
231

 
(32
)
 
199

Interest rate hedging instruments
 
22

 
(3
)
 
19

Total long-term derivative assets(3)
 
$
327

 
$
(109
)
 
$
218

Total derivative assets
 
$
1,367

 
$
(975
)
 
$
392

 
 
 
 
 
 
 
Derivative (liabilities):
 
 
 
 
 
 
Commodity exchange traded derivatives contracts
 
$
(702
)
 
$
702

 
$
—

Commodity forward contracts
 
(389
)
 
209

 
(180
)
Interest rate hedging instruments
 
(17
)
 
—

 
(17
)
Total current derivative (liabilities)(3)
 
$
(1,108
)
 
$
911

 
$
(197
)
Commodity exchange traded derivatives contracts
 
(88
)
 
88

 
—

Commodity forward contracts
 
(140
)
 
35

 
(105
)
Interest rate hedging instruments
 
(17
)
 
3

 
(14
)
Total long-term derivative (liabilities)(3)
 
$
(245
)
 
$
126

 
$
(119
)
Total derivative liabilities
 
$
(1,353
)
 
$
1,037

 
$
(316
)
Net derivative assets (liabilities)
 
$
14

 
$
62

 
$
76

____________
(1)
At December 31, 2018 and 2017, we had $244 million and $155 million of collateral under master netting arrangements that were not offset against our derivative instruments on the Consolidated Balance Sheets primarily related to initial margin requirements.
(2)
At December 31, 2018, current and long-term derivative assets are shown net of collateral of $(58) million and $(8) million, respectively, and current and long-term derivative liabilities are shown net of collateral of $49 million and $64 million, respectively.
(3)
At December 31, 2017, current and long-term derivative assets are shown net of collateral of $(8) million and $(2) million, respectively, and current and long-term derivative liabilities are shown net of collateral of $52 million and $20 million, respectively.
Derivative Instrument by Accounting Designation
 
December 31, 2018
 
December 31, 2017
 
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
$
40

 
$
10

 
$
26

 
$
31

Total derivatives designated as cash flow hedging instruments
$
40

 
$
10

 
$
26

 
$
31

 
 
 
 
 
 
 
 
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
 
Commodity instruments
$
262

 
$
433

 
$
366

 
$
285

Total derivatives not designated as hedging instruments
$
262

 
$
433

 
$
366

 
$
285

Total derivatives
$
302

 
$
443

 
$
392

 
$
316
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 Statements of Operations for the years ended December 31, 2018, 2017 and 2016 (in millions):
 
2018
 
2017
 
2016
Realized gain (loss)(1)(2)
 
 
 
 
 
Commodity derivative instruments
$
193

 
$
7

 
$
235

Total realized gain
$
193

 
$
7

 
$
235

 
 
 
 
 
 
Mark-to-market gain (loss)(3)
 
 
 
 
 
Commodity derivative instruments
$
(208
)
 
$
(171
)
 
$
(1
)
Interest rate hedging instruments
3

 
2

 
2

Total mark-to-market gain (loss)
$
(205
)
 
$
(169
)
 
$
1

Total activity, net
$
(12
)
 
$
(162
)
 
$
236

___________
(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 financial derivative activity related to the acquisition of Champion Energy, Calpine Solutions and North American Power.
(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 Not Designated as Hedging Instruments [Table Text Block]
 
2018
 
2017
 
2016
Realized and mark-to-market gain (loss)(1)
 
 
 
 
 
Derivatives contracts included in operating revenues(2)(3)
$
(369
)
 
$
(69
)
 
$
109

Derivatives contracts included in fuel and purchased energy expense(2)(3)
354

 
(95
)
 
125

Interest rate hedging instruments included in interest expense
3

 
2

 
2

Total activity, net
$
(12
)
 
$
(162
)
 
$
236


___________
(1)
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.
(2)
Does not include the realized value associated with derivative instruments that settle through physical delivery.
(3)
Includes amortization of acquisition date fair value of financial derivative activity related to the acquisition of Champion Energy, Calpine Solutions and North American Power.
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 years ended December 31, 2018, 2017 and 2016 (in millions):
 
Gain (Loss) Recognized  in
OCI (Effective Portion)
 
Gain (Loss) Reclassified from
AOCI into Income (Effective
Portion)(3)(4)
 
2018
 
2017
 
2016
 
2018
 
2017
 
2016
 
Affected Line Item on the Consolidated Statements of Operations
Interest rate hedging instruments(1)(2)
$
45

 
$
21

 
$
41

 
$
(5
)
 
$
(43
)
 
$
(43
)
 
Interest expense
Interest rate hedging instruments(1)(2)
1

 
5

 
—

 
(1
)
 
(5
)
 
—

 
Depreciation expense
Total
$
46

 
$
26

 
$
41

 
$
(6
)
 
$
(48
)
 
$
(43
)
 
 
____________
(1)
We recorded a gain of $1 million on hedge ineffectiveness related to our interest rate hedging instruments designated as cash flow hedges during the years ended December 31, 2018 and 2017. 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 year ended December 31, 2016.
(2)
We recorded income tax expense of $5 million, $6 million and $1 million for the years ended December 31, 2018, 2017 and 2016, 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 $34 million, $72 million and $90 million at December 31, 2018, 2017 and 2016, respectively. Cumulative cash flow hedge losses attributable to the noncontrolling interest, net of tax, remaining in AOCI were $3 million, $6 million and $8 million at December 31, 2018, 2017 and 2016, respectively.
(4)
Includes losses of $1 million, nil and $3 million that were reclassified from AOCI to interest expense for the years ended December 31, 2018, 2017 and 2016, respectively, where the hedged transactions became probable of not occurring.