Annual report pursuant to Section 13 and 15(d)

Net Income per Common Unit (Details)

v3.20.4
Net Income per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Jan. 27, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                        
Net Income   $ 409 $ (67) $ 406 $ 435 $ 448 $ 110 $ 232 $ 385 $ 1,183 $ 1,175 $ 1,274
Declared distributions                   1,375 1,278 1,162
Assumed allocation of undistributed net income (loss) [1]                   $ (192) $ (103) $ 112
Weighted average units outstanding                   399.3 348.6 348.6
Basic and diluted net income per unit   $ 0.77 $ (0.08) $ 0.78 $ 0.84 $ 0.87 $ 0.19 $ 0.44 $ 0.75 $ 2.32 $ 2.25 $ 2.51
Common Units [Member]                        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                        
Net Income                   $ 930 $ 829 $ 899
Declared distributions                   1,080 858 795
Assumed allocation of undistributed net income (loss) [1]                   (155) (73) 79
Assumed allocation of net income                   $ 925 $ 785 $ 874
Weighted average units outstanding                   399.3 348.6 348.6
Basic and diluted net income per unit                   $ 2.32 $ 2.25 $ 2.51
Common Units [Member] | Subsequent Event [Member]                        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                        
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.655                      
Subordinated Units [Member]                        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                        
Net Income                   $ 229 $ 322 $ 349
Declared distributions                   174 333 309
Assumed allocation of undistributed net income (loss) [1]                   (33) (28) 31
Assumed allocation of net income                   $ 141 $ 305 $ 340
Weighted average units outstanding                   84.7 135.4 135.4
Basic and diluted net income per unit                   $ 1.67 $ 2.25 $ 2.51
General Partner [Member]                        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                        
Net Income                   $ 24 $ 24 $ 26
Declared distributions                   27 26 22
Assumed allocation of undistributed net income (loss) [1]                   (4) (2) 2
Assumed allocation of net income                   23 24 24
IDR [Member]                        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                        
Declared distributions                   94 62 36
Assumed allocation of undistributed net income (loss) [1]                   0 0 0
Assumed allocation of net income                   $ 94 $ 62 $ 36
[1] Under our partnership agreement, the IDRs participate in net income only to the extent of the amount of cash distributions actually declared, thereby excluding the IDRs from participating in undistributed net income.