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Partners' Capital and Distributions - Noncontrolling Interest in Subsidiaries (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Noncontrolling Interest [Line Items] |  |  |  |
Distributions paid | $ 179 | $ 184 | $ 365 | $ 496
Noncontrolling Interests |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Distributions paid |  | $ 4 | 6 | $ 4
Red River LLC | Noncontrolling Interests |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Distributions paid |  |  | $ 6 |

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- Definition Total distributions to each class of partners (i.e., general, limited and preferred partners). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770 + Details
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