Future Policy Benefits Reserves - Schedule of Balances and Changes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Present value of future net premiums
Balance, January 1		$ 3,710	$ 3,991	$ 4,735
Effect of changes in discount rate	$ (125)	(74)	(880)
Balance, January 1, at original locked in discount rate	3,585	3,917	3,855
Effect of changes in cash flow assumptions		111	28	352
Expect of actual variances from expected experience		(41)	(126)	(49)
Adjusted balance, January 1		3,655	3,819	4,158
Interest accrual	183	202	216
Net premiums: earned during period	(420)	(436)	(457)
Balance, end of period at original locked in discount rate	3,418	3,585	3,917
Effect of changes in discount rate	7	125	74
Balance, December 31	3,425	3,710	3,991
Present value of future benefits & expenses
Balance, January 1		17,669	17,471	22,745
Effect of changes in discount rate	440	(578)	(125)	(5,942)
Balance, January 1, at original locked in discount rate	17,091	17,346	16,803
Effect of changes in cash flow assumptions		126	36	538
Effect of actual variances from expected experience		69	(46)	(21)
Adjusted balance, January 1		17,286	17,336	17,320
Interest accrual	924	962	979
Benefit & expense payments	(1,187)	(1,207)	(953)
Balance, end of period at original locked in discount rate	17,023	17,091	17,346
Effect of changes in discount rate	(440)	578	125	$ 5,942
Balance, December 31	16,583	17,669	17,471
Net LFPB	13,158	13,959	13,480
Re-measurement loss of insurance claims and policyholders’ benefits	$ (125)	$ (88)	$ (214)