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Quarterly Results of Operations (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
Selected Quarterly Financial Information [Abstract]                      
Revenues $ 5,007 $ 5,153 $ 4,156 $ 4,251 $ 4,357 $ 4,050 $ 3,903 $ 3,917 $ 18,567 $ 16,227 $ 16,667
Total benefits and expenses 4,843 4,773 3,891 3,900 3,976 4,127 3,756 3,650 17,407 15,509 15,282
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest 164 380 265 351 381 (77) 147 267 1,160 718 1,385
Net Income $ 160 $ 289 $ 207 $ 253 $ 293 $ (75) $ 106 $ 197 $ 909 $ 521 $ 1,170
Earnings Per Share, Diluted [Abstract]                      
Diluted earnings per share $ 2.37 $ 4.29 $ 3.05 $ 3.72 $ 4.30 $ (1.13) $ 1.55 $ 2.91 $ 13.44 $ 7.64 $ 17.13
Basic earnings per share:                      
Basic earnings per share $ 2.40 $ 4.34 $ 3.09 $ 3.77 $ 4.36 $ (1.13) $ 1.57 $ 2.93 $ 13.60 $ 7.73 $ 17.26