Annual report pursuant to Section 13 and 15(d)

Net Income per Common Unit

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Net Income per Common Unit
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Net Income per Common Unit NET INCOME PER COMMON UNIT
 
Net income per common unit for a given period is based on the distributions that will be made to the unitholders with respect to the period plus an allocation of undistributed net income based on provisions of the partnership agreement, divided by the weighted average number of common units outstanding. Distributions paid by us are presented on the Consolidated Statements of Partners’ Equity. On January 27, 2021, we declared a $0.655 distribution per common unit and the related distribution to our general partner and IDR holders that was paid on February 12, 2021 to unitholders of record as of February 8, 2021 for the period from October 1, 2020 to December 31, 2020.

The two-class method dictates that net income for a period be reduced by the amount of available cash that will be distributed with respect to that period and that any residual amount representing undistributed net income to be allocated to common unitholders and other participating unitholders to the extent that each unit may share in net income as if all of the net income for the period had been distributed in accordance with the partnership agreement. Undistributed income is allocated to participating securities based on the distribution waterfall for available cash specified in the partnership agreement. Undistributed losses (including those resulting from distributions in excess of net income) are allocated to common units and other participating securities on a pro rata basis based on provisions of the partnership agreement. Distributions are treated as distributed earnings in the computation of earnings per common unit even though cash distributions are not necessarily derived from current or prior period earnings.

The following table provides a reconciliation of net income and the allocation of net income to the common units, the subordinated units, the general partner units and IDRs for purposes of computing basic and diluted net income per unit (in millions, except per unit data).
  Limited Partner Units
  Total Common Units Subordinated Units General Partner Units IDR
Year Ended December 31, 2020
Net income $ 1,183 
Declared distributions 1,375  1,080  174  27  94 
Assumed allocation of undistributed net loss (1) $ (192) (155) (33) (4) — 
Assumed allocation of net income $ 925  $ 141  $ 23  $ 94 
Weighted average units outstanding 399.3  84.7 
Basic and diluted net income per unit $ 2.32  $ 1.67 
Year Ended December 31, 2019
Net income $ 1,175 
Declared distributions 1,278  858  333  26  62 
Assumed allocation of undistributed net loss (1) $ (103) (73) (28) (2) — 
Assumed allocation of net income $ 785  $ 305  $ 24  $ 62 
Weighted average units outstanding 348.6  135.4 
Basic and diluted net income per unit $ 2.25  $ 2.25 
Year Ended December 31, 2018
Net income $ 1,274 
Declared distributions 1,162  795  309  22  36 
Assumed allocation of undistributed net income (1) $ 112  79  31  2  — 
Assumed allocation of net income $ 874  $ 340  $ 24  $ 36 
Weighted average units outstanding 348.6  135.4 
Basic and diluted net income per unit $ 2.51  $ 2.51 
(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.