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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Assets |  |  |  |
Balance at beginning of period | $ 625 | $ 676 | $ 618 | $ 565
Total gains (losses) included in: Net income | 24 | (19) | 22 | 73
Total gains (losses) included in: OCI | (2) | (1) | 0 | (6)
Transfers Into Level 3 | 0 | 2 | 16 | 2
Transfers Out of Level 3 | 0 | (1) | 0 | (28)
Purchases | 14 | 56 | 92 | 168
Sales | (14) | (66) | (98) | (101)
Issues | 0 | 0 | 0 | 0
Settlements | 0 | (2) | (3) | (28)
Balance at end of period | 647 | 645 | 647 | 645
Net investment income |  |  |  |
Total Level 3 gains (losses) included in net income |  |  |  |
Gain (loss) included in earnings | $ (1) | $ 4 | $ (3) | $ 17
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
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment income | Net investment income | Net investment income | Net investment income
Net gains (losses) on investments and derivatives |  |  |  |
Total Level 3 gains (losses) included in net income |  |  |  |
Gain (loss) included in earnings | $ 25 | $ (23) | $ 25 | $ 56
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
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 | Net gains (losses) on investments and derivatives | Net gains (losses) on investments and derivatives
Municipal |  |  |  |
Assets |  |  |  |
Balance at beginning of period | $ 12 | $ 18 | $ 21 | $ 18
Total gains (losses) included in: Net income | 0 | 0 | 3 | 0
Total gains (losses) included in: OCI | 0 | 0 | (1) | 1
Transfers Into Level 3 | 0 | 2 | 0 | 2
Transfers Out of Level 3 | 0 | (1) | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | (1) | 0 | (10) | 0
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | (2) | (2)
Balance at end of period | 11 | 19 | 11 | 19
Corporate - public |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 26 | 77 | 69 | 20
Total gains (losses) included in: Net income | 0 | 0 | (1) | 0
Total gains (losses) included in: OCI | (1) | (2) | 1 | (6)
Transfers Into Level 3 | 0 | 0 | 0 | 0
Transfers Out of Level 3 | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 66
Sales | 0 | (7) | (44) | (10)
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | (2)
Balance at end of period | 25 | 68 | 25 | 68
Corporate - privately placed |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 60 | 73 | 55 | 66
Total gains (losses) included in: Net income | 0 | 1 | (11) | 20
Total gains (losses) included in: OCI | (1) | 1 | 0 | (1)
Transfers Into Level 3 | 0 | 0 | 16 | 0
Transfers Out of Level 3 | 0 | 0 | 0 | 0
Purchases | 0 | 18 | 1 | 32
Sales | 0 | (22) | (2) | (46)
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Balance at end of period | 59 | 71 | 59 | 71
ABS |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 34 | 18 | 28 | 40
Total gains (losses) included in: Net income | 0 | 0 | 0 | 1
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 | (28)
Purchases | 4 | 30 | 11 | 37
Sales | 0 | 0 | 0 | 0
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | (1) | (2)
Balance at end of period | 38 | 48 | 38 | 48
Fixed income securities |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 132 | 186 | 173 | 144
Total gains (losses) included in: Net income | 0 | 1 | (9) | 21
Total gains (losses) included in: OCI | (2) | (1) | 0 | (6)
Transfers Into Level 3 | 0 | 2 | 16 | 2
Transfers Out of Level 3 | 0 | (1) | 0 | (28)
Purchases | 4 | 48 | 12 | 135
Sales | (1) | (29) | (56) | (56)
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | (3) | (6)
Balance at end of period | 133 | 206 | 133 | 206
Equity securities |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 381 | 372 | 333 | 349
Total gains (losses) included in: Net income | 15 | (16) | 22 | 13
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 | 8 | 70 | 10
Sales | (13) | (37) | (42) | (45)
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Balance at end of period | 383 | 327 | 383 | 327
Short-term investments |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 6 | 8 | 6 | 5
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 | 10 | 0 | 10 | 23
Sales | 0 | 0 | 0 | 0
Issues | 0 | 0 | 0 | 0
Settlements | 0 | (2) | 0 | (22)
Balance at end of period | 16 | 6 | 16 | 6
Other investments |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 2 | 2 | 3 | 2
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
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Balance at end of period | 2 | 2 | 2 | 2
Other assets |  |  |  |
Assets |  |  |  |
Balance at beginning of period | 104 | 108 | 103 | 65
Total gains (losses) included in: Net income | 9 | (4) | 10 | 39
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
Issues | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Balance at end of period | $ 113 | $ 104 | $ 113 | $ 104

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