Insurance Subsidiary Financial Information and Regulatory Matters - Schedule of Statutory Accounting Practices Disclosure (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Iowa
Statutory Accounting Practices
Statutory Capital and Surplus:	$ 991		$ 991		$ 1,735
Iowa \| F&G Segment
Statutory Accounting Practices
Statutory Net income (loss):	(75)	$ (13)	(159)	$ (216)
New York
Statutory Accounting Practices
Statutory Capital and Surplus:	127		127		122
New York \| F&G Segment
Statutory Accounting Practices
Statutory Net income (loss):	3	1	7	7
Vermont \| Raven Re (VT)
Statutory Accounting Practices
Statutory Capital and Surplus:	178		178		182
Vermont \| Raven Re (VT) \| F&G Segment
Statutory Accounting Practices
Statutory Net income (loss):	7	8	22	28
Vermont \| Corbeau Re (VT)
Statutory Accounting Practices
Statutory Capital and Surplus:	241		241		236
Vermont \| Corbeau Re (VT) \| F&G Segment
Statutory Accounting Practices
Statutory Net income (loss):	(19)	(70)	(80)	(168)
Cayman Islands
Statutory Accounting Practices
Statutory Net income (loss):			7	$ 0
Cayman Islands \| F&G Segment
Statutory Accounting Practices
Statutory Net income (loss):	18	$ (19)
Statutory Capital and Surplus:	$ 1,215		$ 1,215		$ 1,134