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Equity - Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
Apr. 25, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Incentive Distribution Made to Managing Member or General Partner [Line Items] |  |  |
Distributions declared (including IDRs) |  | $ 483 | $ 279
General partner's distributions |  | 0 | 5
General partner's incentive distribution rights |  | 0 | 60
Total general partner's distributions |  | 0 | 65
Partners' distributions |  | 483 | 279
Limited Partners Common Units |  |  |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |  |  |
Partners' distributions |  | 467 | 198
Preferred Units |  |  |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |  |  |
Partners' distributions |  | $ 16 | $ 16
Subsequent Event |  |  |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |  |  |
Declaration date | Apr. 25, 2018 |  |
Distributions declared (including IDRs) | $ 467 |  |
Cash distributions declared per limited partner common unit | $ 0.6175 |  |
Distribution date | May 15, 2018 |  |
Date of record | May 07, 2018 |  |

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