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Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Millions, $ in Millions | Total | Preferred Units [Member] | Preferred Partner [Member] | Units [Member] | Limited Partners [Member] | Accumulated Other Comprehensive Loss [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance, units at Dec. 31, 2016 |  |  |  |  |  | 54.2 |  |  |  |
Beginning balance at Dec. 31, 2016 |  | $ 2,566 | [1] |  |  |  | $ 1,746 | $ (3) | $ 823 | [1]
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 58 | [1],[2],[3] |  |  |  | 12 |  | 46 | [1]
Other comprehensive income (loss) |  | 3 | [1],[4] |  |  |  |  | 1 | 2 | [1]
Related party contributions | [1] | 309 |  |  |  |  |  |  | 309 |
Related party distributions | [1] | (60) |  |  |  |  |  |  | (60) |
Changes in non-economic ownership interests and equity method investee | [1] | (1) |  |  |  |  |  |  | (1) |
Distributions to unitholders |  | (19) | [1] |  |  |  | (19) |  |  |
Ending balance, units at Mar. 31, 2017 |  |  |  |  |  | 54.2 |  |  |  |
Ending balance at Mar. 31, 2017 |  | 2,856 | [1] |  |  |  | 1,739 | (2) | 1,119 | [1]
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Accrued preferred distributions | [2] | $ 0 |  |  |  |  |  |  |  |
Beginning balance, units at Dec. 31, 2017 |  | 54.2 |  | 14.0 |  | 54.3 |  |  |  |
Beginning balance at Dec. 31, 2017 |  | $ 2,208 | [1],[5] |  | $ 548 |  | 1,639 | 1 | 20 | [1]
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Related party note receivable | [1] | 29 |  |  |  |  |  |  | 29 |
Net income (loss) |  | (21) | [1] |  | 6 |  | 73 |  | (100) | [1]
Other comprehensive income (loss) |  | 1 | [1] |  |  |  |  | 0 | 1 | [1]
Related party distributions | [1] | (64) |  |  |  |  |  |  | (64) |
Changes in non-economic ownership interests and equity method investee | [1] | (6) |  |  |  |  |  |  | (6) |
Differential membership investment activity |  | 23 |  |  |  |  |  |  | 23 |
Distributions to unitholders |  | (28) | [1] |  | (6) |  | (22) |  |  |
Adoption of accounting standards update |  | $ 1,423 |  |  |  |  | 9 |  | 1,414 |
Ending balance, units at Mar. 31, 2018 |  | 54.3 |  | 14.0 |  | 54.3 |  |  |  |
Ending balance at Mar. 31, 2018 |  | $ 3,565 | [1] |  | $ 548 |  | $ 1,699 | $ 1 | $ 1,317 | [1]
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Accrued preferred distributions |  | $ 6 |  |  |  |  |  |  |  |
[1] | At March 31, 2018, approximately $6 million of preferred unit distributions were accrued and are payable in May 2018.
[2] | Prior-period financial information has been retrospectively adjusted as discussed in Note 1 and Note 10 - Restricted Cash.
[3] | Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[4] | Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[5] | {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjZhMmRlOTAyZWEzZTQ3YTk5NDNjMGRmZTNlMmNjNjA3fFRleHRTZWxlY3Rpb246Njc3Q0FFNTY0QzczNUIyOUFFOEFCQjFGQTBFNjYwMDcM}

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