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Notes Payable - Narrative (Details) - USD ($) |  |  |  |  |  |  |  | 9 Months Ended |  |  |  |  |  |  |  |
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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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