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Liability for Future Policy Benefits (Future Policy Benefits Reconciliations) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Insurance [Abstract]      
Benefit reserves, EOP, post-flooring $ 192,302 $ 182,304 $ 245,474
Deferred profit liability, EOP, post-flooring 15,022 14,356 13,140
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring 14,439 12,822 11,934
Subtotal of amounts disclosed above 221,763 209,482 270,548
Other Future Policy Benefits reserves 51,518 52,291 54,394
Future policy benefits $ 273,281 $ 261,773 $ 324,942