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Net Income per Unit (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Feb. 14, 2018
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share Basic [Line Items]      
Income (loss) from continuing operations   $ 109 $ (78)
Distribution to preferred unitholder     (2)
Incentive distribution rights $ 18 18 18
Distributions on nonvested phantom unit awards   2 1
Loss from discontinued operations, net of income taxes   $ 0 $ (237)
Weighted average limited partner units outstanding:      
Common - basic (in shares)   82,711,188 89,753,950
Common - diluted (in shares)   83,380,167 90,271,751
Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership Unit, Basic, Net of Tax   $ 1.08 $ (1.11)
Income (Loss) from Continuing Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Diluted   1.07 (1.11)
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Basic   0.00 (2.63)
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Diluted   $ 0.00 $ (2.63)
Common Units [Member]      
Earnings Per Share Basic [Line Items]      
Income from continuing operations allocated to limited partners   $ 89 $ (99)
Weighted average limited partner units outstanding:      
Common - basic (in shares)   82,711,188 89,753,950
Common - equivalents (in shares)   668,979 517,801
Common - diluted (in shares)   83,380,167 90,271,751
Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership Unit, Basic, Net of Tax   $ 1.08 $ (1.11)
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Basic   $ 0.00 $ (2.63)
Series A Preferred Units [Member]      
Earnings Per Share Basic [Line Items]      
Distribution to preferred unitholder   $ 0 $ (2)