Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Statement of Cash Flows [Abstract]
Net cash provided by operating activities	$ 1,107	$ 995
Proceeds from the sale, maturity, disposal or redemption of:
Fixed maturities	4,964	2,910
Proceeds from Sale of Equity Securities, FV-NI	16	0
Mortgage loans on real estate	513	470
Limited partnerships/corporations	58	61
Acquisition of:
Fixed maturities	(5,253)	(2,355)
Equity securities	(28)	0
Mortgage loans on real estate	(524)	(196)
Limited partnerships/corporations	(156)	(131)
Short-term investments, net	46	85
Derivatives, net	30	(33)
Short-term loan to affiliate, net	(249)	140
Collateral received (delivered), net	51	(7)
Receipts on deposit asset contracts	86	165
Cash and cash equivalents acquired from business acquisition	(274)	0
Other, net	4	3
Net cash provided by (used in) investing activities	(236)	1,172
Cash Flows from Financing Activities:
Deposits received for investment contracts	2,443	1,534
Maturities and withdrawals from investment contracts	(3,125)	(2,997)
Dividends paid and distributions of capital	(394)	(473)
Other, net	9	19
Net cash provided by (used in) financing activities	(1,067)	(1,917)
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation	(196)	250
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation	$ 320	$ 436	$ 516	$ 186