Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Net Income (Loss) per Common Unit - Schedule of Net Income (Loss) per Unit and Allocation of Distribution (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income $ 281 $ 46 $ 616 $ 93
Declared distributions 284 25 562 50
Amortization of beneficial conversion feature of Class B units   0   0
Assumed allocation of undistributed net income $ (3) [1] $ 21 $ 54 [1] $ 43
Weighted average units outstanding 348.6 57.1 348.6 57.1
Net income (loss) per unit $ 0.55 $ (3.71) $ 1.22 $ (4.50)
Common Units [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income     $ 435  
Declared distributions $ 195 $ 25 387 $ 49
Amortization of beneficial conversion feature of Class B units   (237)   (306)
Assumed allocation of undistributed net income (2) [1] 0 38 [1] 0
Assumed allocation of net income $ 193 $ (212) $ 425 $ (257)
Weighted average units outstanding 348.6 57.1 348.6 57.1
Net income (loss) per unit $ 0.55 $ (3.71) $ 1.22 $ (4.50)
Class B Units [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Declared distributions $ 0 $ 0 $ 0 $ 0
Amortization of beneficial conversion feature of Class B units   796   1,030
Assumed allocation of undistributed net income 0 [1] 0 0 [1] 0
Assumed allocation of net income $ 0 $ 796 $ 0 $ 1,030
Weighted average units outstanding 0.0 145.3 0.0 145.3
Subordinated Units [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income     $ 169  
Declared distributions $ 76 $ 0 150 $ 0
Amortization of beneficial conversion feature of Class B units   (559)   (724)
Assumed allocation of undistributed net income (1) [1] 21 15 [1] 43
Assumed allocation of net income $ 75 $ (538) $ 165 $ (681)
Weighted average units outstanding 135.4 135.4 135.4 135.4
Net income (loss) per unit $ 0.55 $ (3.97) $ 1.22 $ (5.03)
General Partner [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income     $ 12  
Declared distributions $ 6 $ 0 12 $ 1
Amortization of beneficial conversion feature of Class B units   0   0
Assumed allocation of undistributed net income 0 [1] 0 1 [1] 0
Assumed allocation of net income 6 0 13 1
IDR [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Declared distributions 7 0 13 0
Amortization of beneficial conversion feature of Class B units   0   0
Assumed allocation of undistributed net income 0 [1] 0 0 [1] 0
Assumed allocation of net income $ 7 $ 0 $ 13 $ 0
[1] 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).