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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