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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Assets |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net realized losses | Net realized losses
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Assets |  |
Beginning balance | $ 2,487 | $ 2,483
Total realized/unrealized gains (losses), Included in net income | (10) | (9)
Total realized/unrealized gains (losses), Included in OCI | (5) | 74
Purchases | 2,201 | 737
Settlements | (514) | (521)
Sales | (196) | (16)
Transfers into Level 3 | 48 | 71
Transfers out of Level 3 | (1,019) | (332)
Ending balance | 2,992 | 2,487
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Equity Securities [Member] |  |
Assets |  |
Beginning balance | 58 | 61
Total realized/unrealized gains (losses), Included in net income | 3 | (1)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 49 | 1
Settlements | (20) | (3)
Sales | (3) | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 87 | 58
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Short-term Investments [Member] |  |
Assets |  |
Beginning balance | 25 | 193
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 145 | 48
Settlements | (72) | (216)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 98 | 25
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Securities available-for-sale and other | Total fixed maturities |  |
Assets |  |
Beginning balance | 2,237 | 2,051
Total realized/unrealized gains (losses), Included in net income | (6) | (7)
Total realized/unrealized gains (losses), Included in OCI | (5) | 74
Purchases | 1,955 | 688
Settlements | (407) | (292)
Sales | (193) | (16)
Transfers into Level 3 | 48 | 71
Transfers out of Level 3 | (1,019) | (332)
Ending balance | 2,610 | 2,237
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Fair Value Option, Other Eligible Items | Total fixed maturities |  |
Assets |  |
Beginning balance | 167 |
Total realized/unrealized gains (losses), Included in net income | (7) |
Total realized/unrealized gains (losses), Included in OCI | 0 |
Purchases | 52 |
Settlements | (15) |
Sales | 0 |
Transfers into Level 3 | 0 |
Transfers out of Level 3 | 0 |
Ending balance | 197 | 167
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | ABS | Securities available-for-sale and other | Total fixed maturities |  |
Assets |  |
Beginning balance | 0 | 30
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 70 | 82
Settlements | 0 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (48) | (112)
Ending balance | 22 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Collateralized Loan Obligations [Member] | Securities available-for-sale and other | Total fixed maturities |  |
Assets |  |
Beginning balance | 113 | 115
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 919 | 102
Settlements | (64) | (49)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (852) | (55)
Ending balance | 116 | 113
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Collateralized Loan Obligations [Member] | Fair Value Option, Other Eligible Items | Total fixed maturities |  |
Assets |  |
Beginning balance | 167 | 178
Total realized/unrealized gains (losses), Included in net income |  | (1)
Total realized/unrealized gains (losses), Included in OCI |  | 0
Purchases |  | 0
Settlements |  | (10)
Sales |  | 0
Transfers into Level 3 |  | 0
Transfers out of Level 3 |  | 0
Ending balance |  | 167
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS | Securities available-for-sale and other | Total fixed maturities |  |
Assets |  |
Beginning balance | 227 | 222
Total realized/unrealized gains (losses), Included in net income | (6) | (2)
Total realized/unrealized gains (losses), Included in OCI | 18 | 3
Purchases | 0 | 6
Settlements | (10) | (18)
Sales | (67) | (5)
Transfers into Level 3 | 39 | 21
Transfers out of Level 3 | (34) | 0
Ending balance | 167 | 227
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate | Securities available-for-sale and other | Total fixed maturities |  |
Assets |  |
Beginning balance | 1,861 | 1,589
Total realized/unrealized gains (losses), Included in net income | 0 | (5)
Total realized/unrealized gains (losses), Included in OCI | (23) | 71
Purchases | 876 | 458
Settlements | (316) | (196)
Sales | (126) | (11)
Transfers into Level 3 | 9 | 50
Transfers out of Level 3 | 0 | (95)
Ending balance | 2,281 | 1,861
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Securities available-for-sale and other | Total fixed maturities |  |
Assets |  |
Beginning balance | 36 | 95
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 90 | 40
Settlements | (17) | (29)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (85) | (70)
Ending balance | $ 24 | $ 36

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