Future Policy Benefit Reserves - Summary of Balances and Changes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Present value of future net premiums
Balance, January 1	$ 3,425	$ 3,710	$ 3,991
Effect of changes in discount rate	(71)	(7)	(125)	$ (74)
Balance, January 1, at original locked in discount rate	3,418	3,585	3,917
Effect of changes in cash flow assumptions		114	111	28
Expect of actual variances from expected experience		(10)	(41)	(126)
Adjusted balance, January 1		3,522	3,655	3,819
Interest accrual	176	183	202
Net premiums: earned during period	(406)	(420)	(436)
Balance, end of period at original locked in discount rate	3,292	3,418	3,585
Effect of changes in discount rate	71	7	125	74
Balance, December 31	3,363	3,425	3,710
Present value of future benefits & expenses
Balance, January 1	16,583	17,669	17,471
Effect of changes in discount rate	173	440	(578)	(125)
Balance, January 1, at original locked in discount rate	17,023	17,091	17,346
Effect of change in cash flow assumptions		121	126	36
Effect of actual variances from expected experience		87	69	(46)
Adjusted balance, January 1		17,231	17,286	17,336
Interest accrual	918	924	962
Benefit & expense payments	(1,165)	(1,187)	(1,207)
Balance, end of period at original locked in discount rate	16,984	17,023	17,091
Effect of changes in discount rate	(173)	(440)	578	$ 125
Balance, December 31	16,811	16,583	17,669
Net LFPB	13,448	13,158	13,959
Insurance claims and policyholders benefits, including policyholders' dividends, remeasurement impact	$ (104)	$ (125)	$ (88)