Annual report pursuant to Section 13 and 15(d)

Summarized Quarterly Financial Data (unaudited) (Details)

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Summarized Quarterly Financial Data (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 1,908 $ 1,476 $ 1,705 $ 1,749 $ 1,897 $ 1,529 $ 1,407 $ 1,593 $ 6,838 $ 6,426 $ 4,304
Income from operations 676 346 455 563 524 492 455 508 2,040 1,979 1,156
Net income $ 448 $ 110 $ 232 $ 385 $ 351 $ 307 $ 281 $ 335 $ 1,175 $ 1,274 $ 490
Net income (loss) per common unit—basic and diluted $ 0.87 [1] $ 0.19 [1] $ 0.44 [1] $ 0.75 [1] $ 0.69 [1] $ 0.60 [1] $ 0.55 [1] $ 0.67 [1] $ 2.25 $ 2.51 $ (1.32)
[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.