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Investments - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 USD ($) investment | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) investment | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) investment
Investments [Line Items] |  |  |  |  |
Decrease in gross AFS securities unrealized losses |  |  | $ 1,500 |  |
Percentage of fair value rated as investment grade | 96.00% |  | 96.00% |  | 96.00%
Losses from loan modifications | $ 1 | $ 1 | $ 3 | $ 1 |
Number of partnerships in alternative investment portfolio | investment | 361 |  | 361 |  | 352
Alternative investments as a percentage of overall invested assets |  |  | 3.00% |  | 3.00%
Fair value of collateral received that we are permitted to sell or re-pledge | $ 25 |  | $ 25 |  |
Fixed maturity available-for-sale securities, at fair value | 90,682 |  | 90,682 |  | $ 88,738
Investment commitments | 5,000 |  | 5,000 |  |
Investment commitments for limited partnerships | 3,200 |  | 3,200 |  |
Investment commitments for mortgage loans on real estate | 1,500 |  | 1,500 |  |
Investment commitments for private placements | 287 |  | 287 |  |
Asset Pledged as Collateral |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Fixed maturity available-for-sale securities, at fair value | 19 |  | 19 |  |
Derivative Counterparties |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Fair value of collateral received that we are permitted to sell or re-pledge | 2,300 |  | 2,300 |  |
Fair value of securities received as collateral that have been resold or repledged | $ 11 |  | $ 11 |  |
Minimum |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements | 80.00% |  | 80.00% |  |
Maximum |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements | 95.00% |  | 95.00% |  |
Corporate bonds |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Amortized cost of portfolio rated below investment grade | $ 3,000 |  | $ 3,000 |  | 3,000
Fair value of portfolio rated below investment grade | 2,900 |  | 2,900 |  | 2,800
Fannie Mae | MBS |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Fair value, concentration of risk, investments | 854 |  | $ 854 |  | $ 739
Fannie Mae | Investments | Lender Concentration Risk | MBS |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Concentration risk |  |  | 1.00% |  | 1.00%
Federal Home Loan Mortgage Corporation | MBS |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Fair value, concentration of risk, investments | 573 |  | $ 573 |  | $ 570
Federal Home Loan Mortgage Corporation | Investments | Lender Concentration Risk | MBS |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Concentration risk |  |  | 1.00% |  | 1.00%
Financial Service | Securities Investment |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Fair value, concentration of risk, investments | 14,000 |  | $ 14,000 |  | $ 14,000
Financial Service | Investments | Lender Concentration Risk | Securities Investment |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Concentration risk |  |  | 11.00% |  | 11.00%
Consumer Non-Cyclical Industry | Securities Investment |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Fair value, concentration of risk, investments | $ 13,600 |  | $ 13,600 |  | $ 13,800
Consumer Non-Cyclical Industry | Investments | Lender Concentration Risk | Securities Investment |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Concentration risk |  |  | 10.00% |  | 11.00%

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