Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Net Income per Common Unit - Schedule of Net Income per Unit and Allocation of Distribution (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]            
Net income $ 232 $ 385 $ 281 $ 335 $ 617 $ 616
Declared distributions 316   284   626 562
Assumed allocation of undistributed net income (loss) $ (84) [1]   $ (3)   $ (9) [1] $ 54 [1]
Weighted average units outstanding 348.6   348.6   348.6 348.6
Basic and diluted net income per unit $ 0.44   $ 0.55   $ 1.19 $ 1.22
Common Units [Member]            
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]            
Net income $ 164 272 $ 199 236    
Declared distributions 211   195   $ 421 $ 387
Assumed allocation of undistributed net income (loss) (58) [1]   (2)   (6) [1] 38 [1]
Assumed allocation of net income $ 153   $ 193   $ 415 $ 425
Weighted average units outstanding 348.6   348.6   348.6 348.6
Basic and diluted net income per unit $ 0.44   $ 0.55   $ 1.19 $ 1.22
Subordinated Units [Member]            
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]            
Net income $ 64 105 $ 77 92    
Declared distributions 83   76   $ 164 $ 150
Assumed allocation of undistributed net income (loss) (24) [1]   (1)   (3) [1] 15 [1]
Assumed allocation of net income $ 59   $ 75   $ 161 $ 165
Weighted average units outstanding 135.4   135.4   135.4 135.4
Basic and diluted net income per unit $ 0.44   $ 0.55   $ 1.19 $ 1.22
General Partner [Member]            
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]            
Net income $ 4 $ 8 $ 5 $ 7    
Declared distributions 7   6   $ 13 $ 12
Assumed allocation of undistributed net income (loss) (2) [1]   0   0 [1] 1 [1]
Assumed allocation of net income 5   6   13 13
IDR [Member]            
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]            
Declared distributions 15   7   28 13
Assumed allocation of undistributed net income (loss) 0 [1]   0   0 [1] 0 [1]
Assumed allocation of net income $ 15   $ 7   $ 28 $ 13
[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).