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Quarterly Results (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 6,400 $ 6,168 $ 6,049 $ 5,910 $ 6,016 $ 5,580 $ 5,373 $ 5,393 $ 24,527 $ 22,362 $ 22,390
Benefits, losses and expenses 5,450 5,355 5,377 5,257 5,281 5,148 4,819 4,852 21,439 20,100 19,485
Net income (loss) 771 651 547 535 592 340 444 443 2,504 1,819 2,371
Less: Preferred stock dividends 5 6 5 5 5 6 5 5 21 21 21
Net income (loss) available to common stockholders $ 766 $ 645 $ 542 $ 530 $ 587 $ 334 $ 439 $ 438 $ 2,483 $ 1,798 $ 2,350
Basic                      
Earnings Per Share, Basic $ 2.55 $ 2.12 $ 1.75 $ 1.69 $ 1.85 $ 1.04 $ 1.34 $ 1.32 $ 8.09 $ 5.54 $ 6.73
Diluted                      
Net income available to common stockholders $ 2.51 $ 2.09 $ 1.73 $ 1.66 $ 1.82 $ 1.02 $ 1.32 $ 1.30 $ 7.97 $ 5.46 $ 6.64