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Equity (Cash Distributions) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 25, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Incentive Distribution Made to Managing Member or General Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to preferred units |  |  |  |  |  |  |  |  |  |  | $ 2,060 | $ 1,288 | $ 938
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution made to limited partner, declaration date |  | Jan. 25, 2019 |  |  |  |  |  |  |  |  |  |  |
Distributions to preferred units |  | $ 514 |  |  |  |  |  |  |  |  |  |  |
Cash distributions declared per limited partner common unit |  | $ 0.6475 |  |  |  |  |  |  |  |  |  |  |
Distribution made to limited partner, distribution date |  | Feb. 14, 2019 |  |  |  |  |  |  |  |  |  |  |
Distribution made to limited partner, date of record |  | Feb. 05, 2019 |  |  |  |  |  |  |  |  |  |  |
Limited Partners Common Units |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to preferred units | [1] |  |  |  |  |  |  |  |  |  | $ 1,985 | $ 895 | $ 692
Cash distributions declared per limited partner common unit |  |  | $ 0.6475 | $ 0.6375 | $ 0.6275 | $ 0.6175 | $ 0.6075 | $ 0.5875 | $ 0.5625 | $ 0.5400 | $ 2.5300 | $ 2.2975 |
[1] | See Note 8 for distribution information.

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