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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Level 3 |  |  |  |  |
Rollforward of Level 3 Net Asset/(Liability) |  |  |  |  |
Beginning Balance | $ (61) | $ (10) | $ (51) | $ (24) |
Net gains/(losses) for the period included in earnings | 18 | (5) | 8 | 18 |
Settlements | 1 | (3) | 1 | (11) |
Derivatives entered into during the period |  | (8) |  | (9) |
Ending Balance | (42) | (26) | (42) | (26) |
Change in unrealized gains/(losses) included in earnings relating to Level 3 derivatives still held at the end of the period | 18 | $ (13) | 8 | $ 9 |
Recurring Fair Value Measures |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 58 |  | 58 |  | $ 53
Recurring Fair Value Measures | Commodity Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 83 |  | 83 |  | 130
Recurring Fair Value Measures | Interest Rate Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (5) |  | (5) |  | (44)
Recurring Fair Value Measures | Foreign Currency Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (3) |  | (3) |  | 1
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (17) |  | (17) |  | (34)
Recurring Fair Value Measures | Level 1 |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 24 |  | 24 |  | 42
Recurring Fair Value Measures | Level 1 | Commodity Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 24 |  | 24 |  | 42
Recurring Fair Value Measures | Level 2 |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 76 |  | 76 |  | 62
Recurring Fair Value Measures | Level 2 | Commodity Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | 84 |  | 84 |  | 105
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (5) |  | (5) |  | (44)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (3) |  | (3) |  | 1
Recurring Fair Value Measures | Level 3 |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (42) |  | (42) |  | (51)
Recurring Fair Value Measures | Level 3 | Commodity Derivatives |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | (25) |  | (25) |  | (17)
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option |  |  |  |  |
Recurring Fair Value Measurements |  |  |  |  |
Total net derivative asset/(liability) | $ (17) |  | $ (17) |  | $ (34)

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- Definition Amount of derivatives entered into classified as a derivative asset (liability) after deduction of derivative asset (liability), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References No definition available. + Details
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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=117815213&loc=d3e19207-110258 + Details
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