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Partners' Capital and Distributions - Equity Offerings (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Partners Capital and Distribution [Line Items] |  |  |
Issuance of units, net proceeds |  |  | $ 1,664
Continuous Offering Program |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Commissions to sales agents |  |  | $ 1
Common Units |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Issuance of units (in units) |  |  | 54,119,893
Issuance of units, net proceeds |  |  | $ 1,664
Common Units | Continuous Offering Program |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Issuance of units (in units) |  |  | 4,033,567
Issuance of units, net proceeds |  |  | $ 129
Common Units | Omnibus Agreement |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Issuance of units (in units) |  |  | 50,086,326
Issuance of units, net proceeds |  |  | $ 1,535
AAP | Omnibus Agreement | Common Units |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Issuance of common units (in units) | 232,425 | 559,649 |
AAP | Omnibus Agreement | Common Units | Continuous Offering Program |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Issuance of units (in units) |  |  | 1,800,000
AAP | Omnibus Agreement | Common Units | Underwritten Offering |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Issuance of units (in units) |  |  | 48,300,000

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