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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, 2024 | Mar. 31, 2023
Assets |  |
Balance at beginning of period | $ 676 | $ 618
Total gains (losses) included in: Net income | 7 | 3
Total gains (losses) included in: OCI | 2 | 2
Transfers Into Level 3 | 0 | 0
Transfers Out of Level 3 | 0 | 0
Purchases | 20 | 42
Sales | (9) | (63)
Issues | 0 | 0
Settlements | (2) | (2)
Balance at end of period | $ 694 | $ 600
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
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment income | Net investment income
Gain (loss) included in earnings | $ 0 | $ (5)
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
Fair Value, Asset, Recurring Basis, Still Held, Unrealized 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 | $ 5 | $ (1)
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
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Operating costs and expenses | Operating costs and expenses
Gain (loss) included in earnings | $ 2 | $ 9
Municipal |  |
Assets |  |
Balance at beginning of period | 11 | 21
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 | (1) | (3)
Issues | 0 | 0
Settlements | (2) | (1)
Balance at end of period | 8 | 17
Corporate - public |  |
Assets |  |
Balance at beginning of period | 26 | 69
Total gains (losses) included in: Net income | 0 | (1)
Total gains (losses) included in: OCI | 2 | 2
Transfers Into Level 3 | 0 | 0
Transfers Out of Level 3 | 0 | 0
Purchases | 0 | 0
Sales | (5) | (41)
Issues | 0 | 0
Settlements | 0 | 0
Balance at end of period | 23 | 29
Corporate - privately placed |  |
Assets |  |
Balance at beginning of period | 58 | 55
Total gains (losses) included in: Net income | (4) | (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 | (2)
Issues | 0 | 0
Settlements | 0 | 0
Balance at end of period | 54 | 49
ABS |  |
Assets |  |
Balance at beginning of period | 58 | 28
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
Issues | 0 | 0
Settlements | 0 | (1)
Balance at end of period | 58 | 27
Fixed income securities |  |
Assets |  |
Balance at beginning of period | 153 | 173
Total gains (losses) included in: Net income | (4) | (5)
Total gains (losses) included in: OCI | 2 | 2
Transfers Into Level 3 | 0 | 0
Transfers Out of Level 3 | 0 | 0
Purchases | 0 | 0
Sales | (6) | (46)
Issues | 0 | 0
Settlements | (2) | (2)
Balance at end of period | 143 | 122
Equity securities |  |
Assets |  |
Balance at beginning of period | 402 | 333
Total gains (losses) included in: Net income | 9 | 0
Total gains (losses) included in: OCI | 0 | 0
Transfers Into Level 3 | 0 | 0
Transfers Out of Level 3 | 0 | 0
Purchases | 0 | 42
Sales | (3) | (17)
Issues | 0 | 0
Settlements | 0 | 0
Balance at end of period | 408 | 358
Short-term investments |  |
Assets |  |
Balance at beginning of period | 1 | 6
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 | 20 | 0
Sales | 0 | 0
Issues | 0 | 0
Settlements | 0 | 0
Balance at end of period | 21 | 6
Other investments |  |
Assets |  |
Balance at beginning of period | 2 | 3
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
Issues | 0 | 0
Settlements | 0 | 0
Balance at end of period | 2 | 2
Other assets |  |
Assets |  |
Balance at beginning of period | 118 | 103
Total gains (losses) included in: Net income | 2 | 9
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
Issues | 0 | 0
Settlements | 0 | 0
Balance at end of period | $ 120 | $ 112

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