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Partners' Capital and Distributions - Distributions, Class A (Details) - Class A Shares - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
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Feb. 12, 2021 | Jan. 07, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of available cash distributed |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Number of days after end of quarter within which distributions must be paid to shareholders |  |  |  |  |  |  |  |  |  |  | 55 days |  |
Cash distributions per Class A share (in dollars per share) |  |  | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.30 | $ 0.90 | $ 1.38 |
Cash Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions paid to limited partners |  |  |  |  |  |  |  |  |  |  | $ 166 | $ 231 | $ 189
Cash distributions per Class A share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.90 | $ 1.38 | $ 1.20
Fourth quarter distribution | Cash Distribution | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions paid to limited partners | $ 35 |  |  |  |  |  |  |  |  |  |  |  |
Distributions per Class A share declared (in dollars per share) |  | $ 0.18 |  |  |  |  |  |  |  |  |  |  |

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- Definition This element represents the percentage of cash distributed out of available cash. + References No definition available. + Details
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- Definition Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP). + 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 + Details
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- Definition Per unit of ownership amount of cash distributions paid to unit-holder of a limited partnership (LP). + 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 + Details
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- Definition The total amount of distributions to limited 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 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770 + Details
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