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Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ (430)	$ (454)	$ (883)	$ (887)
Less: investment expense	23	20	43	40
Net investment income	407	434	840	847
Financing Receivable, Excluding Accrued Interest, Nonaccrual	13		13		$ 71
Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	(369)	(352)	(730)	(703)
Financing Receivable, Excluding Accrued Interest, Nonaccrual	50		50		$ 4
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	(1)	(2)	(3)	(3)
Mortgage loans on real estate
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	(58)	(56)	(115)	(111)
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	(1)	(2)	(3)	(4)
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	(2)	(3)	(5)	(7)
Other than Securities Investment
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ (1)	$ (39)	$ (27)	$ (59)