Notes Payable - Schedule of Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Debt Instrument
Interest expense	$ 42	$ 42	$ 124	$ 123
Revolving Credit Facility - Short-term \| Credit Facility \| Revolving Credit Facility
Debt Instrument
Interest expense	$ 1	0	$ 2	1
7.40% F&G Senior Notes, due 2028 \| Senior Notes
Debt Instrument
Interest rate, stated percentage	7.40%		7.40%
Interest expense	$ 10	10	$ 29	29
6.50% F&G Senior Notes, due 2029 \| Senior Notes
Debt Instrument
Interest rate, stated percentage	6.50%		6.50%
Interest expense	$ 9	10	$ 27	28
6.250% F&G Senior Notes, due 2034 \| Senior Notes
Debt Instrument
Interest rate, stated percentage	6.25%		6.25%
Interest expense	$ 8	8	$ 24	24
7.95% F&G Senior Notes, due 2053 \| Senior Notes
Debt Instrument
Interest rate, stated percentage	7.95%		7.95%
Interest expense	$ 7	7	$ 21	21
7.300% F&G Junior Notes, due 2065 \| Senior Notes
Debt Instrument
Interest rate, stated percentage	7.30%		7.30%
Interest expense	$ 7	$ 7	$ 21	$ 20

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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