Annual report pursuant to Section 13 and 15(d)

Summarized Quarterly Financial Data (unaudited)

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Summarized Quarterly Financial Data (unaudited)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Summarized Quarterly Financial Data (unaudited)
Summarized Quarterly Financial Data—(in millions, except per unit amounts)
  First
Quarter		 Second
Quarter		 Third
Quarter		 Fourth
Quarter
Year Ended December 31, 2020:
Revenues $ 1,718  $ 1,470  $ 982  $ 1,997 
Income from operations 664  684  152  625 
Net income (loss) 435  406  (67) 409 
Net income (loss) per common unit—basic and diluted (1) 0.84  0.78  (0.08) 0.77 
Year Ended December 31, 2019:
        
Revenues $ 1,749  $ 1,705  $ 1,476  $ 1,908 
Income from operations 563  455  346  676 
Net income 385  232  110  448 
Net income per common unit—basic and diluted (1) 0.75  0.44  0.19  0.87 
(1)The sum of the quarterly net income per common unit may not equal the full year amount as the undistributed income and loss allocations and computations of the weighted average common units outstanding for basic and diluted common units outstanding for each quarter and the full year are performed independently.