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Fair Value of Financial Instruments - Components of the Transfers In and Out of Level 3 (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |
Transfers Into Level 3 | $ 92 | $ 280 | $ 352
Transfers Out of Level 3 | (743) | (608) | (3,400)
Total | (651) | (328) | (3,048)
Corporate bonds |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |
Transfers Into Level 3 | 22 | 195 | 296
Transfers Out of Level 3 | (153) | (206) | (2,968)
Total | (131) | (11) | (2,672)
State and municipal bonds |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |
Transfers Into Level 3 | 0 |  | 36
Transfers Out of Level 3 | (5) |  | 0
Total | (5) |  | 36
Foreign government bonds |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |
Transfers Into Level 3 |  |  | 0
Transfers Out of Level 3 |  |  | (5)
Total |  |  | (5)
RMBS |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |
Transfers Into Level 3 | 0 | 12 | 0
Transfers Out of Level 3 | (5) | (5) | (25)
Total | (5) | 7 | (25)
CMBS |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |
Transfers Into Level 3 | 0 | 12 | 0
Transfers Out of Level 3 | (28) | 0 | (17)
Total | (28) | 12 | (17)
ABS |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |
Transfers Into Level 3 | 50 | 2 | 16
Transfers Out of Level 3 | (497) | (377) | (332)
Total | (447) | (375) | (316)
Hybrid and redeemable preferred securities |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |
Transfers Into Level 3 | 10 | 16 | 0
Transfers Out of Level 3 | 0 | (13) | (4)
Total | 10 | 3 | (4)
Trading securities |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |
Transfers Into Level 3 |  | 6 | 4
Transfers Out of Level 3 |  | (7) | (19)
Total |  | (1) | (15)
Equity securities |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |
Transfers Into Level 3 | 0 | 6 | 0
Transfers Out of Level 3 | (4) | 0 | (15)
Total | (4) | 6 | (15)
Other investments |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |
Transfers Into Level 3 | 10 |  |
Transfers Out of Level 3 | 0 |  |
Total | 10 |  |
Derivative liabilities |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |
Transfers Into Level 3 | 0 | 31 | 0
Transfers Out of Level 3 | (51) | 0 | (15)
Total | $ (51) | $ 31 | $ (15)

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