v3.20.2

Derivative Instruments (Details 4) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Summary of Derivative Instruments by Risk Exposure [Abstract] |  |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | [1] | $ 39 | $ 244 | $ 213 | $ 400
Gain (Loss) on Sale of Derivatives | [2],[3] | 18 | 58 | 15 | 169
Mark-to-market gain (loss) | [4] | 21 | 186 | 198 | 231
Sales [Member] |  |  |  |  |
Summary of Derivative Instruments by Risk Exposure [Abstract] |  |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | [1],[5],[6] | 34 | 541 | 541 | 578
Cost of Sales [Member] |  |  |  |  |
Summary of Derivative Instruments by Risk Exposure [Abstract] |  |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | [1],[5],[6] | 37 | (296) | (272) | (176)
Interest Expense [Member] |  |  |  |  |
Summary of Derivative Instruments by Risk Exposure [Abstract] |  |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | [1] | (32) | (1) | (56) | (2)
Interest rate hedging instruments |  |  |  |  |
Summary of Derivative Instruments by Risk Exposure [Abstract] |  |  |  |  |
Gain (Loss) on Sale of Derivatives | [2],[3],[7] | (18) | 0 | (18) | 0
Mark-to-market gain (loss) | [4] | (14) | (1) | (38) | (2)
Energy Related Derivative |  |  |  |  |
Summary of Derivative Instruments by Risk Exposure [Abstract] |  |  |  |  |
Gain (Loss) on Sale of Derivatives | [2],[3] | 36 | 58 | 33 | 169
Mark-to-market gain (loss) | [4] | $ 35 | $ 187 | $ 236 | $ 233
[1] | In addition to changes in market value on derivatives not designated as hedges, changes in mark-to-market gain (loss) also includes 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 and Calpine Solutions.
[4] | In addition to changes in market value on derivatives not designated as hedges, changes in mark-to-market gain (loss) also includes adjustments to reflect changes in credit default risk exposure.
[5] | Does not include the realized value associated with derivative instruments that settle through physical delivery.
[6] | Includes amortization of acquisition date fair value of financial derivative activity related to the acquisition of Champion Energy and Calpine Solutions.
[7] | Includes costs associated with the termination of de-designated interest rate hedging instruments recorded to interest expense related to our Steamboat project debt that was repaid in June 2020.

X
- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
Name: | us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
Name: | us-gaap_GainLossOnSaleOfDerivatives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SummaryOfDerivativeInstrumentsByRiskExposureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
Name: | us-gaap_UnrealizedGainLossOnDerivatives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_InterestExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_EnergyRelatedDerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |