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Quarterly Financial Data (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
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
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 10,034 $ 9,955 $ 7,338 $ 11,627 $ 13,720 $ 13,495 $ 13,877 $ 13,121 $ 38,954 $ 54,213 $ 54,087
Operating income 1,339 244 1,336 61 1,627 1,830 1,819 1,927 2,980 7,203 5,403
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent         1,276 1,161 1,208 1,180 140 4,825 3,685
Net income (loss) 833 (401) 672 (964) 1,276 1,161 1,208 1,180 140 4,825 3,420
Limited Partners’ interest in net income (loss) $ 509 $ (655) $ 353 $ (854) $ 937 $ 831 $ 877 $ 869 $ (647) $ 3,514 $ 1,713
Basic $ 0.19 $ (0.24) $ 0.13 $ (0.32) $ 0.37 $ 0.33 $ 0.33 $ 0.31 $ (0.24) $ 1.34 $ 1.20
Diluted $ 0.19 $ (0.24) $ 0.13 $ (0.32) $ 0.37 $ 0.33 $ 0.33 $ 0.31 (0.24) 1.33 1.19
Basic                 (0.24) 1.34 1.21
Diluted                 $ (0.24) $ 1.33 $ 1.20