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Notes Payable - Narrative (Details) - USD ($)								9 Months Ended
	Jun. 04, 2024	Feb. 21, 2023	Nov. 22, 2022	Sep. 17, 2021	Sep. 15, 2020	Jun. 12, 2020	Apr. 20, 2018	Sep. 30, 2024	Sep. 30, 2023	Apr. 23, 2024	Feb. 16, 2024	Feb. 15, 2024	Dec. 31, 2023	Dec. 06, 2023	Jan. 13, 2023	Jun. 01, 2020	Aug. 13, 2018
Debt Instrument [Line Items]
Debt service payments								$ 250,000,000	$ 8,000,000
Outstanding debt								4,186,000,000					$ 3,887,000,000
Outstanding principal								$ 4,235,000,000
6.50% F&G Notes, net of discount | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 550,000,000
Debt instrument, interest rate, stated percentage	6.50%							6.50%
Price as percent of par on offering of unsecured notes	99.74%
Debt issuance costs, net	$ 6,000,000
Outstanding debt								$ 544,000,000					0
5.50% F&G Senior Notes | F&G
Debt Instrument [Line Items]
Aggregate principal amount																$ 550,000,000
Debt instrument, interest rate, stated percentage																5.50%
Price as percent of par on offering of unsecured notes							99.50%
Proceeds from issuance of senior notes							$ 547,000,000
5.50% F&G Senior Notes | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.50%		5.50%					5.50%
Debt service payments	$ 250,000,000
Outstanding debt								$ 304,000,000					561,000,000
7.95% F&G Notes, net of discount | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount														$ 345,000,000
Debt instrument, interest rate, stated percentage								7.95%						7.95%
Debt issuance costs, net														$ 9,000,000
Outstanding debt								$ 336,000,000					336,000,000
7.40% F&G Senior Notes | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount															$ 500,000,000
Debt instrument, interest rate, stated percentage								7.40%							7.40%
Outstanding debt								$ 496,000,000					495,000,000
F&G Credit Agreement
Debt Instrument [Line Items]
Outstanding debt								$ 358,000,000					362,000,000
F&G Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)			1.00%
F&G Credit Agreement | Revolving Credit Facility | Fed Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)			0.50%
F&G Credit Agreement | Senior Notes
Debt Instrument [Line Items]
Maturity date, principal amount, maximum			$ 150,000,000
F&G Credit Agreement | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility		$ 665,000,000	$ 550,000,000								$ 750,000,000	$ 665,000,000
Debt, period prior to maturity date (days)			91 days
Prior debt redeemed or paid and any refinancing of debt incurred matures period (at least)			91 days
Period from effective date			3 years
Credit facility, increase in borrowing commitments		$ 115,000,000
F&G Credit Agreement | Line of Credit | Revolving Credit Facility | Condition One | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)			0.30%
F&G Credit Agreement | Line of Credit | Revolving Credit Facility | Condition One | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)			0.80%
F&G Credit Agreement | Line of Credit | Revolving Credit Facility | Condition Two | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)			1.30%
F&G Credit Agreement | Line of Credit | Revolving Credit Facility | Condition Two | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)			1.80%
3.20% Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount				$ 450,000,000
Debt instrument, interest rate, stated percentage				3.20%
Proceeds from issuance debt				$ 443,000,000
3.20% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								3.20%		3.20%
Outstanding debt								$ 444,000,000					444,000,000
Revolving Credit Facility | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Debt issuance costs, net								4,000,000
Outstanding debt								4,000,000					2,000,000
Line of credit facility											$ 800,000,000
Outstanding principal								0
Remaining borrowing capacity								$ 800,000,000
2.45% Notes, net of discount
Debt Instrument [Line Items]
Aggregate principal amount					$ 600,000,000
Debt instrument, interest rate, stated percentage					2.45%
Proceeds from issuance debt					$ 593,000,000
2.45% Notes, net of discount | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								2.45%		2.45%
Outstanding debt								$ 595,000,000					594,000,000
Term Loan | Term Loan
Debt Instrument [Line Items]
Repayments of all outstanding indebtedness under term loan credit agreement					$ 260,000,000
Repayment of principal borrowed						$ 640,000,000
3.40% Notes, net of discount
Debt Instrument [Line Items]
Aggregate principal amount						$ 650,000,000
Debt instrument, interest rate, stated percentage						3.40%
Proceeds from issuance debt						$ 642,000,000
3.40% Notes, net of discount | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								3.40%		3.40%
Outstanding debt								$ 645,000,000					644,000,000
4.50% unsecured notes due August 2028
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage																	4.50%
Price as percent of par on offering of unsecured notes																	99.252%
Annual interest rate																	4.594%
4.50% unsecured notes due August 2028 | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount																	$ 450,000,000
Debt instrument, interest rate, stated percentage								4.50%		4.50%							4.50%
Outstanding debt								$ 446,000,000					$ 446,000,000

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