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Net Loss per Common Unit - Schedule of Net Loss per Unit and Allocation of Distribution (Details)

v3.8.0.1
Net Loss per Common Unit - Schedule of Net Loss per Unit and Allocation of Distribution (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income (loss) $ 490 $ (171) $ (319)
Declared distributions 514 99 99
Amortization of beneficial conversion feature of Class B units 0 0 0
Amortization of beneficial conversion feature of Class B units including prior periods effect   0  
Assumed allocation of undistributed net loss $ (24) $ (270) $ (418)
Weighted average units outstanding 178.5 57.1 57.1
Net loss per unit $ (1.32) $ (0.20) $ (0.43)
Common Units [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income (loss) $ 294 $ (50) $ (93)
Declared distributions 376 97 97
Amortization of beneficial conversion feature of Class B units (594) (29) 0
Amortization of beneficial conversion feature of Class B units including prior periods effect   (29)  
Assumed allocation of undistributed net loss (17) (79) (121)
Assumed allocation of net income (loss) $ (235) $ (11) $ (24)
Weighted average units outstanding 178.5 57.1 57.1
Net loss per unit [1] $ (1.32) $ (0.20) $ (0.43)
Class B Units [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income (loss) $ 0 $ 0 $ 0
Declared distributions 0 0 0
Amortization of beneficial conversion feature of Class B units 2,004 99 1
Amortization of beneficial conversion feature of Class B units including prior periods effect   100  
Assumed allocation of undistributed net loss 0 0 0
Assumed allocation of net income (loss) $ 2,004 $ 100 $ 0
Weighted average units outstanding 84.8 145.3 145.3
Subordinated Units [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income (loss) $ 186 $ (117) $ (220)
Declared distributions 127 0 0
Amortization of beneficial conversion feature of Class B units (1,410) (70) (1)
Amortization of beneficial conversion feature of Class B units including prior periods effect   (71)  
Assumed allocation of undistributed net loss (7) (186) (288)
Assumed allocation of net income (loss) $ (1,290) $ (257) $ (288)
Weighted average units outstanding 135.4 135.4 135.4
Net loss per unit [1] $ (9.52) $ (1.90) $ (2.13)
General Partner [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income (loss) $ 10 $ (4) $ (6)
Declared distributions 10 2 2
Amortization of beneficial conversion feature of Class B units 0 0 0
Amortization of beneficial conversion feature of Class B units including prior periods effect   0  
Assumed allocation of undistributed net loss 0 (5) (8)
Assumed allocation of net income (loss) 10 (3) (6)
IDR [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Declared distributions 1 0 0
Amortization of beneficial conversion feature of Class B units 0    
Amortization of beneficial conversion feature of Class B units including prior periods effect   0  
Assumed allocation of undistributed net loss 0 [2] 0 0
Assumed allocation of net income (loss) $ 1 $ 0 $ 0
[1] Earnings per unit in the table may not recalculate exactly due to rounding because it is calculated based on whole numbers, not the rounded numbers presented.
[2] Under our partnership agreement, the IDRs participate in net income (loss) only to the extent of the amount of cash distributions actually declared, thereby excluding the IDRs from participating in undistributed net income (loss).