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Partners' Capital and Distributions - Equity Offerings (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Partners Capital and Distribution [Line Items] |  |  |  |
Issuance of units, net proceeds |  |  | $ 1,664 | $ 805
General partners' proportionate capital contributions |  |  | 0 | 42
Continuous and Underwritten Offerings | General Partner |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
General partners' proportionate capital contributions |  |  |  | 9
Continuous Offering Program |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Commissions to sales agents |  |  | $ 1 | $ 8
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 | 26,278,288
Issuance of units, net proceeds |  |  | $ 129 | $ 805
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 |
Omnibus Agreement | Common Units | Continuous Offering Program | AAP |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Issuance of units (in units) |  |  | 1,800,000 |
Omnibus Agreement | Common Units | Underwritten Offering | AAP |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Issuance of units (in units) | 48,300,000 |  |  |
AAP | Omnibus Agreement | Common Units |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Issuance of common units (in units) |  | 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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