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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, 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 $ 13,720 $ 13,495 $ 13,877 $ 13,121 $ 13,573 $ 14,514 $ 14,118 $ 11,882 $ 54,213 $ 54,087 $ 40,523
Operating income 1,701 1,830 1,819 1,927 1,419 1,703 1,126 1,100 7,277 5,348 2,721
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent         852 1,393 659 726 4,899 3,630 2,543
Net income 1,350 1,161 1,208 1,180 852 1,391 633 489 4,899 3,365 2,366
Limited Partners’ interest in net income $ 1,011 $ 831 $ 877 $ 869 $ 617 $ 370 $ 330 $ 341 $ 3,588 $ 1,658 $ 915
Basic $ 0.38 $ 0.32 $ 0.33 $ 0.33 $ 0.26 $ 0.32 $ 0.30 $ 0.31 $ 1.37 $ 1.16 $ 0.85
Diluted 0.38 0.32 0.33 0.33 0.26 0.32 0.30 0.31 1.36 1.15 0.83
Basic 0.38 0.32 0.33 0.33 0.26 0.32 0.30 0.32 1.37 1.17 0.86
Diluted $ 0.38 $ 0.32 $ 0.33 $ 0.33 $ 0.26 $ 0.32 $ 0.30 $ 0.32 $ 1.36 $ 1.16 $ 0.84