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Notes Payable - Schedule of Long Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Feb. 01, 2025	Jan. 13, 2025	Dec. 31, 2024	Oct. 04, 2024	Jun. 04, 2024	Dec. 06, 2023	Jan. 13, 2023	Sep. 17, 2021	Sep. 15, 2020	Jun. 12, 2020	Aug. 13, 2018	Apr. 20, 2018
Debt Instrument [Line Items]
Notes payable	$ 4,398			$ 4,321
4.50% Notes, net of discount | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.50%											4.50%
Notes payable	$ 447			447
3.40% Notes, net of discount
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage											3.40%
3.40% Notes, net of discount | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.40%
Notes payable	$ 646			646
2.45% Notes, net of discount
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage										2.45%
2.45% Notes, net of discount | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.45%
Notes payable	$ 596			595
3.20% Notes, net of discount
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage									3.20%
3.20% Notes, net of discount | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.20%
Notes payable	$ 444			444
Revolving Credit Facility | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Revolving Credit Agreement	(3)			(4)
F&G Credit Agreement
Debt Instrument [Line Items]
Notes payable	$ 0			0
6.50% F&G Notes, net of discount | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.50%					6.50%
Notes payable	$ 546			545
7.40% F&G Senior Notes | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.40%							7.40%
Notes payable	$ 497			497
5.50% F&G Notes, net of discount | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.50%	5.50%				5.50%							5.50%
Notes payable	$ 0			301
7.95% F&G Notes, net of discount | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.95%						7.95%
Notes payable	$ 336			336
6.25% F&G Notes, net of discount | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.25%				6.25%
Notes payable	$ 493			492
7.30% F&G Notes, net of discount | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.30%		7.30%
Notes payable	$ 364			0
Other
Debt Instrument [Line Items]
Notes payable	$ 32			$ 22

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