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Quarterly Results (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 13,647 $ 13,208 $ 12,220 $ 12,337 $ 13,011 $ 12,480 $ 12,646 $ 12,451 $ 51,412 $ 50,588 $ 41,909
Net income (loss) from continuing operations applicable to common shareholders (310) (694) (1,042) 630 1,111 183 1,399 2,385 (1,416) 5,078 5,314
Income (loss) from discontinued operations, net of tax 0 0 0 0 (321) 325 196 (3,793) 0 (3,593) 147
Net income (loss) applicable to common shareholders $ (310) $ (694) $ (1,042) $ 630 $ 790 $ 508 $ 1,595 $ (1,408) $ (1,416) $ 1,485 $ 5,461
Basic                      
Continuing operations (in dollars per share) $ (1.17) $ (2.58) $ (3.81) $ 2.27 $ 3.90 $ 0.62 $ 4.68 $ 7.88 $ (5.22) $ 17.23 $ 17.06
Discontinued operations (in dollars per share) 0 0 0 0 (1.13) 1.11 0.66 (12.53) 0 (12.19) 0.47
Basic, Total (in dollars per share) (1.17) (2.58) (3.81) 2.27 2.77 1.73 5.34 (4.65) (5.22) 5.04 17.53
Diluted                      
Continuing operations (in dollars per share) (1.17) (2.58) (3.81) 2.24 3.84 0.62 4.61 7.78 (5.22) 16.98 16.84
Discontinued operations (in dollars per share) 0 0 0 0 (1.11) 1.09 0.65 (12.38) 0 (12.02) 0.47
Diluted, Total (in dollars per share) $ (1.17) $ (2.58) $ (3.81) $ 2.24 $ 2.73 $ 1.71 $ 5.26 $ (4.60) $ (5.22) $ 4.96 $ 17.31