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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Level 3 |  |  |  |  |
Rollforward of Level 3 Net Asset/(Liability) |  |  |  |  |
Beginning Balance | $ (92) | $ (61) | $ (29) | $ (51) |
Net gains/(losses) for the period included in earnings | 77 | 18 | 9 | 8 |
Settlements | 2 | 1 | 7 | 1 |
Ending Balance | (13) | (42) | (13) | (42) |
Change in unrealized losses included in earnings relating to Level 3 derivatives still held at the end of the period | 77 | $ 18 | 9 | $ 8 |
Recurring Fair Value Measures |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (326) |  | (326) |  | $ (267)
Recurring Fair Value Measures | Commodity Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (395) |  | (395) |  | (301)
Recurring Fair Value Measures | Interest Rate Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 75 |  | 75 |  | 46
Recurring Fair Value Measures | Foreign Currency Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (1) |  | (1) |  | 2
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (5) |  | (5) |  | (14)
Recurring Fair Value Measures | Level 1 |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (246) |  | (246) |  | (143)
Recurring Fair Value Measures | Level 1 | Commodity Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (246) |  | (246) |  | (143)
Recurring Fair Value Measures | Level 1 | Interest Rate Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 0 |  | 0 |  | 0
Recurring Fair Value Measures | Level 1 | Foreign Currency Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 0 |  | 0 |  | 0
Recurring Fair Value Measures | Level 1 | Preferred Distribution Rate Reset Option |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 0 |  | 0 |  | 0
Recurring Fair Value Measures | Level 2 |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (67) |  | (67) |  | (95)
Recurring Fair Value Measures | Level 2 | Commodity Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (141) |  | (141) |  | (143)
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 75 |  | 75 |  | 46
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (1) |  | (1) |  | 2
Recurring Fair Value Measures | Level 2 | Preferred Distribution Rate Reset Option |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 0 |  | 0 |  | 0
Recurring Fair Value Measures | Level 3 |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (13) |  | (13) |  | (29)
Recurring Fair Value Measures | Level 3 | Commodity Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (8) |  | (8) |  | (15)
Recurring Fair Value Measures | Level 3 | Interest Rate Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 0 |  | 0 |  | 0
Recurring Fair Value Measures | Level 3 | Foreign Currency Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 0 |  | 0 |  | 0
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | $ (5) |  | $ (5) |  | $ (14)

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- Definition Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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