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)

v3.19.1
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
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income $ 385 $ 335
Declared distributions 310 278
Assumed allocation of undistributed net income [1] $ 75 $ 57
Weighted average units outstanding 348.6 348.6
Basic and diluted net income per unit $ 0.75 $ 0.67
Common Units [Member]    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income $ 272 $ 236
Declared distributions 210 192
Assumed allocation of undistributed net income [1] 52 40
Assumed allocation of net income $ 262 $ 232
Weighted average units outstanding 348.6 348.6
Basic and diluted net income per unit $ 0.75 $ 0.67 [2]
Subordinated Units [Member]    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income $ 105 $ 92
Declared distributions 81 74
Assumed allocation of undistributed net income [1] 21 16
Assumed allocation of net income $ 102 $ 90
Weighted average units outstanding 135.4 135.4
Basic and diluted net income per unit $ 0.75 $ 0.67 [2]
General Partner [Member]    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income $ 8 $ 7
Declared distributions 6 6
Assumed allocation of undistributed net income [1] 2 1
Assumed allocation of net income 8 7
IDR [Member]    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Declared distributions 13 6
Assumed allocation of undistributed net income [1] 0 0
Assumed allocation of net income $ 13 $ 6
[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).
[2] 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.