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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Change in Useful Life |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Increase in depreciation expense | $ 18 |  |  | $ 36 |  |
Common Units |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Impact to basic net income per common unit (usd per unit) | $ (0.37) |  | $ 0.13 | $ 0.14 | $ (3.85) |
Impact to diluted net income per common unit (usd per unit) | (0.37) |  | $ 0.13 | 0.14 | $ (3.85) |
Common Units | Change in Useful Life |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Impact to basic net income per common unit (usd per unit) | (0.02) |  |  | (0.05) |  |
Impact to diluted net income per common unit (usd per unit) | $ (0.02) |  |  | $ (0.05) |  |
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 | Change in Useful 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 | Change in Useful Life |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property and equipment, useful life |  | 50 years |  |  |  |

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