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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and amortization | $ 177 | $ 168 |
Service Life |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and amortization | $ 18 |  |
Common Units |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Basic net income/(loss) per common unit (usd per unit) | $ 0.51 | $ (3.98) |
Diluted net income/(loss) per common unit (usd per unit) | 0.51 | $ (3.98) |
Common Units | Service Life |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Basic net income/(loss) per common unit (usd per unit) | (0.03) |  |
Diluted net income/(loss) per common unit (usd per unit) | $ (0.03) |  |
Pipeline and related facilities and Storage, terminal and rail facilities | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, useful life |  |  | 10 years
Pipeline and related facilities and Storage, terminal and rail facilities | Minimum | Service Life |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, useful life | 10 years |  |
Pipeline and related facilities and Storage, terminal and rail facilities | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, useful life |  |  | 70 years
Pipeline and related facilities and Storage, terminal and rail facilities | Maximum | Service Life |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, useful life | 50 years |  |

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