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Net Income per Unit (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Earnings Per Share Basic [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | $ 326 | $ 56 | $ 156
Less: Net income and comprehensive income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 | 0 | 4
Less: Preacquisition income (loss) allocated to general partner |  |  |  |  |  |  |  |  | 0 | 0 |
Income from continuing operations attributable to partners |  |  |  |  |  |  |  |  | 326 | 56 | 77
Preferred Units, Cumulative Cash Distributions |  |  |  |  |  |  |  |  | 23 | 0 | 0
Incentive distribution rights |  |  |  |  |  |  |  |  | 85 | 81 | 30
Distributions on nonvested phantom unit awards |  |  |  |  |  |  |  |  | 6 | 5 | 2
Income from continuing operations allocated to limited partners |  |  |  |  |  |  |  |  | 212 | (30) | 45
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | (177) | (462) | 38
Income from discontinued operations allocated to limited partners |  |  |  |  |  |  |  |  | $ (177) | $ (462) | $ 10
Income (Loss) from Continuing Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Diluted |  |  |  |  |  |  |  |  | $ 2.12 | $ (0.32) | $ 0.91
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Basic |  |  |  |  |  |  |  |  | (1.78) | (4.94) | 0.20
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Diluted |  |  |  |  |  |  |  |  | $ (1.78) | $ (4.94) | $ 0.20
Common Units [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Basic [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average limited partner units outstanding (basic) (in shares) |  |  |  |  |  |  |  |  | 99,270,120 | 93,575,530 | 40,253,913
Weighted average limited partner units outstanding, Equivalents (in shares) |  |  |  |  |  |  |  |  | 458,234 | 28,305 | 21,738
Weighted average limited partner units outstanding (diluted) (in shares) |  |  |  |  |  |  |  |  | 99,728,354 | 93,603,835 | 40,275,651
Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership Unit, Basic, Net of Tax | $ 1.91 | $ 0.92 | $ (0.58) | $ (0.11) | $ (1.51) | $ 0.09 | $ 0.60 | $ 0.56 | $ 2.13 | $ (0.32) | $ 0.91
Income (Loss) from Continuing Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Diluted | 1.90 | 0.91 | (0.59) | (0.11) | (1.51) | 0.09 | 0.60 | 0.56 |  |  |
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Basic | 0.11 | 0.17 | (1.94) | (0.11) | (4.81) | 0.15 | (0.07) | (0.09) |  |  |
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Diluted | $ 0.11 | $ 0.17 | $ (1.94) | $ (0.11) | $ (4.81) | $ 0.15 | $ (0.07) | $ (0.09) |  |  |
Subordinated Units [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Basic [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average limited partner units outstanding (basic and diluted) (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 10,010,333
Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.00 | $ 1.17
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic and Diluted Share |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.00 | $ 0.23
Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Basic [Line Items] |  |  |  |  |  |  |  |  |  |  |
Less: Preacquisition income (loss) allocated to general partner |  |  |  |  |  |  |  |  |  |  | $ 28
Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Basic [Line Items] |  |  |  |  |  |  |  |  |  |  |
Less: Preacquisition income (loss) allocated to general partner |  |  |  |  |  |  |  |  |  |  | $ 75

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