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Fair Value of Assets and Liabilities - Schedule of Rollforward of Level 3 Assets and Liabilities Held at Fair Value (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Assets |  |
Balance at beginning of period | $ 802 | $ 676
Total gains (losses) included in: Net income | 12 | 7
Total gains (losses) included in: OCI | 1 | 2
Transfers Into Level 3 | 26 | 0
Transfers Out of Level 3 | (7) | 0
Purchases | 25 | 20
Sales | (13) | (9)
Settlements | (1) | (2)
Balance at end of period | $ 845 | $ 694
Net investment income |  |
Total Level 3 gains (losses) included in net income |  |
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment income | Net investment income
Gain (loss) included in earnings | $ 13 | $ 0
Net gains (losses) on investments and derivatives |  |
Total Level 3 gains (losses) included in net income |  |
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net gains (losses) on investments and derivatives | Net gains (losses) on investments and derivatives
Gain (loss) included in earnings | $ (1) | $ 5
Operating costs and expenses |  |
Total Level 3 gains (losses) included in net income |  |
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Operating costs and expenses | Operating costs and expenses
Gain (loss) included in earnings | $ 0 | $ 2
Municipal |  |
Assets |  |
Balance at beginning of period | 2 | 11
Total gains (losses) included in: Net income | 0 | 0
Total gains (losses) included in: OCI | 0 | 0
Transfers Into Level 3 | 0 | 0
Transfers Out of Level 3 | 0 | 0
Purchases | 0 | 0
Sales | 0 | (1)
Settlements | 0 | (2)
Balance at end of period | 2 | 8
Corporate - public |  |
Assets |  |
Balance at beginning of period | 22 | 26
Total gains (losses) included in: Net income | (1) | 0
Total gains (losses) included in: OCI | 1 | 2
Transfers Into Level 3 | 0 | 0
Transfers Out of Level 3 | (7) | 0
Purchases | 20 | 0
Sales | 0 | (5)
Settlements | 0 | 0
Balance at end of period | 35 | 23
Corporate - privately placed |  |
Assets |  |
Balance at beginning of period | 110 | 58
Total gains (losses) included in: Net income | (1) | (4)
Total gains (losses) included in: OCI | 0 | 0
Transfers Into Level 3 | 0 | 0
Transfers Out of Level 3 | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Balance at end of period | 109 | 54
Asset-backed securities (“ABS”) |  |
Assets |  |
Balance at beginning of period | 114 | 58
Total gains (losses) included in: Net income | 0 | 0
Total gains (losses) included in: OCI | 0 | 0
Transfers Into Level 3 | 26 | 0
Transfers Out of Level 3 | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements | (1) | 0
Balance at end of period | 139 | 58
Fixed income securities |  |
Assets |  |
Balance at beginning of period | 248 | 153
Total gains (losses) included in: Net income | (2) | (4)
Total gains (losses) included in: OCI | 1 | 2
Transfers Into Level 3 | 26 | 0
Transfers Out of Level 3 | (7) | 0
Purchases | 20 | 0
Sales | 0 | (6)
Settlements | (1) | (2)
Balance at end of period | 285 | 143
Equity securities |  |
Assets |  |
Balance at beginning of period | 407 | 402
Total gains (losses) included in: Net income | 14 | 9
Total gains (losses) included in: OCI | 0 | 0
Transfers Into Level 3 | 0 | 0
Transfers Out of Level 3 | 0 | 0
Purchases | 4 | 0
Sales | (9) | (3)
Settlements | 0 | 0
Balance at end of period | 416 | 408
Short-term investments |  |
Assets |  |
Balance at beginning of period | 5 | 1
Total gains (losses) included in: Net income | 0 | 0
Total gains (losses) included in: OCI | 0 | 0
Transfers Into Level 3 | 0 | 0
Transfers Out of Level 3 | 0 | 0
Purchases | 1 | 20
Sales | (4) | 0
Settlements | 0 | 0
Balance at end of period | 2 | 21
Other investments |  |
Assets |  |
Balance at beginning of period | 1 | 2
Total gains (losses) included in: Net income | 0 | 0
Total gains (losses) included in: OCI | 0 | 0
Transfers Into Level 3 | 0 | 0
Transfers Out of Level 3 | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Balance at end of period | 1 | 2
Other assets |  |
Assets |  |
Balance at beginning of period | 134 | 118
Total gains (losses) included in: Net income | 0 | 2
Total gains (losses) included in: OCI | 0 | 0
Transfers Into Level 3 | 0 | 0
Transfers Out of Level 3 | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Balance at end of period | 134 | $ 120
Assets held for sale |  |
Assets |  |
Balance at beginning of period | 7 |
Total gains (losses) included in: Net income | 0 |
Total gains (losses) included in: OCI | 0 |
Transfers Into Level 3 | 0 |
Transfers Out of Level 3 | 0 |
Purchases | 0 |
Sales | 0 |
Settlements | 0 |
Balance at end of period | $ 7 |

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