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Investments - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) partnership | Dec. 31, 2023 USD ($) partnership | Dec. 31, 2022 USD ($)
Investments [Line Items] |  |  |
Increase in gross AFS securities unrealized losses | $ 1,200 |  |
Percentage of fair value rated as investment grade | 96.00% | 96.00% |
Amortized cost of portfolio rated below investment grade | $ 2,900 | $ 3,000 |
Fair value of portfolio rated below investment grade | 2,800 | 2,800 |
Losses from loan modifications (less than) | 3 | 1 |
Trading securities change in gross gain (loss) | $ (2) | $ 81 | $ (632)
Number of partnerships in alternative investment portfolio | partnership | 371 | 352 |
Alternative investments as a percentage of overall invested assets | 3.00% | 3.00% |
Investment commitments | $ 4,300 |  |
Investment commitments for limited partnerships | 3,200 |  |
Investment commitments for mortgage loans on real estate | 828 |  |
Investment commitments for private placements | 230 |  |
Derivative Counterparties |  |  |
Investments [Line Items] |  |  |
Fair value of collateral received that we are permitted to sell or re-pledge | 2,600 |  |
Fair value of securities received as collateral that have been resold or repledged | $ 63 |  |
Minimum |  |  |
Investments [Line Items] |  |  |
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements | 80.00% |  |
Maximum |  |  |
Investments [Line Items] |  |  |
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements | 95.00% |  |
Mortgage loans on real estate | Commercial | Geographic Concentration Risk | California |  |  |
Investments [Line Items] |  |  |
Concentration risk | 27.00% | 27.00% |
Mortgage loans on real estate | Commercial | Geographic Concentration Risk | Texas |  |  |
Investments [Line Items] |  |  |
Concentration risk | 10.00% | 9.00% |
Mortgage loans on real estate | Residential | Geographic Concentration Risk | California |  |  |
Investments [Line Items] |  |  |
Concentration risk | 14.00% | 14.00% |
Mortgage loans on real estate | Residential | Geographic Concentration Risk | New York |  |  |
Investments [Line Items] |  |  |
Concentration risk | 14.00% | 12.00% |
Fannie Mae | MBS |  |  |
Investments [Line Items] |  |  |
Fair value, concentration of risk, investments | $ 851 | $ 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 | $ 566 | $ 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 | $ 13,400 | $ 14,000 |
Financial Service | Investments | Lender Concentration Risk | Securities Investment |  |  |
Investments [Line Items] |  |  |
Concentration risk | 10.00% | 11.00% |
Consumer Non-Cyclical Industry | Securities Investment |  |  |
Investments [Line Items] |  |  |
Fair value, concentration of risk, investments | $ 12,900 | $ 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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