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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Assets |  |  |  |
Balance at beginning of period | $ 845 | $ 694 | $ 802 | $ 676
Total gains (losses) included in: Net income | 19 | (3) | 31 | 4
Total gains (losses) included in: OCI | 2 | (1) | 3 | 1
Transfers Into Level 3 | 0 | 0 | 26 | 0
Transfers Out of Level 3 | (26) | 0 | (33) | 0
Purchases | 18 | 35 | 43 | 55
Sales | (83) | (48) | (96) | (57)
Settlements | (2) | (2) | (3) | (4)
Balance at end of period | 773 | 675 | 773 | 675
Liabilities |  |  |  |
Balance at the beginning of the period | (1) | 0 | 0 | 0
Total gains (losses) included in: net income | 0 | 0 | (1) | 0
Total gains (losses) included in: OCI | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Balance at the end of the period | $ (1) | $ 0 | $ (1) | $ 0
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 | Net investment income | Net investment income
Gain (loss) included in earnings | $ 0 | $ 1 | $ 0 | $ 1
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 | Net gains (losses) on investments and derivatives | Net gains (losses) on investments and derivatives
Gain (loss) included in earnings | $ 16 | $ (5) | $ 27 | $ 0
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 | Operating costs and expenses | Operating costs and expenses
Gain (loss) included in earnings | $ 3 | $ 1 | $ 3 | $ 3
Other liabilities |  |  |  |
Liabilities |  |  |  |
Balance at the beginning of the period | (1) |  | 0 |
Total gains (losses) included in: net income | 0 |  | (1) |
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 the end of the period | (1) |  | (1) |
Municipal |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 2 | 8 | 2 | 11
Total gains (losses) included in: Net income | 0 | 0 | 0 | 0
Total gains (losses) included in: OCI | 0 | 0 | 0 | 0
Transfers Into Level 3 | 0 | 0 | 0 | 0
Transfers Out of Level 3 | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | (1) | 0 | (2)
Settlements | 0 | 0 | 0 | (2)
Balance at end of period | 2 | 7 | 2 | 7
Corporate - public |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 35 | 23 | 22 | 26
Total gains (losses) included in: Net income | 0 | 1 | (1) | 1
Total gains (losses) included in: OCI | 0 | (1) | 1 | 1
Transfers Into Level 3 | 0 | 0 | 0 | 0
Transfers Out of Level 3 | 0 | 0 | (7) | 0
Purchases | 0 | 11 | 20 | 11
Sales | 0 | (4) | 0 | (9)
Settlements | 0 | 0 | 0 | 0
Balance at end of period | 35 | 30 | 35 | 30
Corporate - privately placed |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 109 | 54 | 110 | 58
Total gains (losses) included in: Net income | 0 | (2) | (1) | (6)
Total gains (losses) included in: OCI | 1 | 0 | 1 | 0
Transfers Into Level 3 | 0 | 0 | 0 | 0
Transfers Out of Level 3 | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | (2) | 0 | (2)
Settlements | (1) | 0 | (1) | 0
Balance at end of period | 109 | 50 | 109 | 50
ABS |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 51 |  | 26 |
Total gains (losses) included in: Net income | 0 |  | 0 |
Total gains (losses) included in: OCI | 0 |  | 0 |
Transfers Into Level 3 | 0 |  | 26 |
Transfers Out of Level 3 | (26) |  | (26) |
Purchases | 15 |  | 15 |
Sales | 0 |  | 0 |
Settlements | (1) |  | (2) |
Balance at end of period | 39 |  | 39 |
MBS |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 88 |  | 88 |
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 | 88 |  | 88 |
ABS and MBS |  |  |  |
Assets |  |  |  |
Balance at beginning of period |  | 58 |  | 58
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 |  | 14 |  | 14
Sales |  | 0 |  | 0
Settlements |  | (1) |  | (1)
Balance at end of period |  | 71 |  | 71
Fixed income securities |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 285 | 143 | 248 | 153
Total gains (losses) included in: Net income | 0 | (1) | (2) | (5)
Total gains (losses) included in: OCI | 1 | (1) | 2 | 1
Transfers Into Level 3 | 0 | 0 | 26 | 0
Transfers Out of Level 3 | (26) | 0 | (33) | 0
Purchases | 15 | 25 | 35 | 25
Sales | 0 | (7) | 0 | (13)
Settlements | (2) | (1) | (3) | (3)
Balance at end of period | 273 | 158 | 273 | 158
Equity securities |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 416 | 408 | 407 | 402
Total gains (losses) included in: Net income | 16 | (3) | 30 | 6
Total gains (losses) included in: OCI | 0 | 0 | 0 | 0
Transfers Into Level 3 | 0 | 0 | 0 | 0
Transfers Out of Level 3 | 0 | 0 | 0 | 0
Purchases | 1 | 9 | 5 | 9
Sales | (75) | (21) | (84) | (24)
Settlements | 0 | 0 | 0 | 0
Balance at end of period | 358 | 393 | 358 | 393
Short-term investments |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 2 | 21 | 5 | 1
Total gains (losses) included in: Net income | 0 | 0 | 0 | 0
Total gains (losses) included in: OCI | 0 | 0 | 0 | 0
Transfers Into Level 3 | 0 | 0 | 0 | 0
Transfers Out of Level 3 | 0 | 0 | 0 | 0
Purchases | 2 | 1 | 3 | 21
Sales | 0 | (20) | (4) | (20)
Settlements | 0 | (1) | 0 | (1)
Balance at end of period | 4 | 1 | 4 | 1
Other investments |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 1 | 2 | 1 | 2
Total gains (losses) included in: Net income | 0 | 0 | 0 | 0
Total gains (losses) included in: OCI | 0 | 0 | 0 | 0
Transfers Into Level 3 | 0 | 0 | 0 | 0
Transfers Out of Level 3 | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Balance at end of period | 1 | 2 | 1 | 2
Other assets |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 134 | 120 | 134 | 118
Total gains (losses) included in: Net income | 3 | 1 | 3 | 3
Total gains (losses) included in: OCI | 0 | 0 | 0 | 0
Transfers Into Level 3 | 0 | 0 | 0 | 0
Transfers Out of Level 3 | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Balance at end of period | 137 | $ 121 | 137 | $ 121
Assets held for sale |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 7 |  | 7 |
Total gains (losses) included in: Net income | 0 |  | 0 |
Total gains (losses) included in: OCI | 1 |  | 1 |
Transfers Into Level 3 | 0 |  | 0 |
Transfers Out of Level 3 | 0 |  | 0 |
Purchases | 0 |  | 0 |
Sales | (8) |  | (8) |
Settlements | 0 |  | 0 |
Balance at end of period | $ 0 |  | $ 0 |

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