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Fair Value Measurements - Changes in Level 3 Recurring Fair Value Measurements, Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | $ 4,055 | $ 4,990 | $ 4,151 | $ 5,062
Net Realized and Unrealized Gains (Losses) Included in Income | 21 | (9) | 20 | 19
Other Comprehensive Income (Loss) | (22) | 69 | 34 | 64
Purchases, Sales, Issuances and Settlements, Net | (202) | (253) | (440) | (440)
Gross Transfers In | 437 | 9 | 552 | 153
Gross Transfers Out | (52) | (412) | (67) | (479)
Other | 44 | (26) | 31 | (11)
Fair Value End of Period | 4,281 | 4,368 | 4,281 | 4,368
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | (30) | (12) | (40)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | $ (29) | $ 48 | $ 27 | $ 29
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Adjusted Revenues | Adjusted Revenues | Adjusted Revenues | Adjusted Revenues
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) | Other comprehensive income (loss) | Other comprehensive income (loss) | Other comprehensive income (loss)
Net realized gains/(losses) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Realized Investment Gains (Losses) | Realized Investment Gains (Losses) | Realized Investment Gains (Losses) | Realized Investment Gains (Losses)
Bonds available for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | $ 3,487 | $ 4,392 | $ 3,439 | $ 4,475
Net Realized and Unrealized Gains (Losses) Included in Income | 23 | (11) | 32 | 21
Other Comprehensive Income (Loss) | (22) | 69 | 34 | 64
Purchases, Sales, Issuances and Settlements, Net | (162) | (268) | (293) | (454)
Gross Transfers In | 435 | 7 | 550 | 143
Gross Transfers Out | (50) | (411) | (51) | (475)
Other | 44 | (26) | 44 | (22)
Fair Value End of Period | 3,755 | 3,752 | 3,755 | 3,752
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 0 | 0 | 0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | (29) | 48 | 27 | 29
Bonds available for sale | Obligations of states, municipalities and political subdivisions |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 4 | 15 | 3 | 20
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss) | 0 | 1 | 0 | 1
Purchases, Sales, Issuances and Settlements, Net | 0 | 0 | 1 | (5)
Gross Transfers In | 0 | 0 | 0 | 0
Gross Transfers Out | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Fair Value End of Period | 4 | 16 | 4 | 16
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 0 | 0 | 0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 | 0 | 1
Bonds available for sale | Non-U.S. governments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 7 | 9 | 7 | 2
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss) | 0 | 1 | 0 | 1
Purchases, Sales, Issuances and Settlements, Net | 0 | (2) | 0 | (2)
Gross Transfers In | 0 | 0 | 0 | 7
Gross Transfers Out | 0 | (2) | 0 | (2)
Other | 0 | 0 | 0 | 0
Fair Value End of Period | 7 | 6 | 7 | 6
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 0 | 0 | 0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 1 | 0 | 1
Bonds available for sale | Corporate debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 383 | 728 | 323 | 879
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | (4) | 1 | (4)
Other Comprehensive Income (Loss) | (2) | 10 | (2) | 17
Purchases, Sales, Issuances and Settlements, Net | (22) | (131) | (60) | (347)
Gross Transfers In | 36 | 1 | 134 | 108
Gross Transfers Out | (36) | (186) | (37) | (235)
Other | 0 | 0 | 0 | 0
Fair Value End of Period | 359 | 418 | 359 | 418
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 0 | 0 | 0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | (2) | 4 | (1) | 3
Bonds available for sale | RMBS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 1,766 | 1,896 | 1,792 | 1,884
Net Realized and Unrealized Gains (Losses) Included in Income | 24 | 30 | 47 | 59
Other Comprehensive Income (Loss) | (29) | 56 | (2) | 26
Purchases, Sales, Issuances and Settlements, Net | (75) | (36) | (150) | (18)
Gross Transfers In | 287 | 0 | 287 | 0
Gross Transfers Out | (1) | (43) | (2) | (48)
Other | 44 | (35) | 44 | (35)
Fair Value End of Period | 2,016 | 1,868 | 2,016 | 1,868
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 0 | 0 | 0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | (30) | 56 | (2) | 24
Bonds available for sale | CMBS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 43 | 220 | 25 | 207
Net Realized and Unrealized Gains (Losses) Included in Income | (4) | (22) | (4) | (22)
Other Comprehensive Income (Loss) | 6 | (2) | 6 | (1)
Purchases, Sales, Issuances and Settlements, Net | (18) | 0 | (18) | 1
Gross Transfers In | 68 | 0 | 85 | 11
Gross Transfers Out | (1) | (148) | 0 | (148)
Other | 0 | 0 | 0 | 0
Fair Value End of Period | 94 | 48 | 94 | 48
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 0 | 0 | 0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | (4) | 1 | (12)
Bonds available for sale | CLO/ABS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 1,284 | 1,524 | 1,289 | 1,483
Net Realized and Unrealized Gains (Losses) Included in Income | 3 | (15) | (12) | (12)
Other Comprehensive Income (Loss) | 3 | 3 | 32 | 20
Purchases, Sales, Issuances and Settlements, Net | (47) | (99) | (66) | (83)
Gross Transfers In | 44 | 6 | 44 | 17
Gross Transfers Out | (12) | (32) | (12) | (42)
Other | 0 | 9 | 0 | 13
Fair Value End of Period | 1,275 | 1,396 | 1,275 | 1,396
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 0 | 0 | 0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 3 | (9) | 29 | 12
Other bond securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 243 | 228 | 234 | 223
Net Realized and Unrealized Gains (Losses) Included in Income | 2 | (1) | 1 | 3
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0
Purchases, Sales, Issuances and Settlements, Net | (5) | 23 | 5 | 16
Gross Transfers In | 2 | 0 | 2 | 0
Gross Transfers Out | (2) | 0 | (2) | (3)
Other | (2) | 0 | (2) | 11
Fair Value End of Period | 238 | 250 | 238 | 250
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 1 | (29) | (1) | (32)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 | 0 | 0
Other bond securities | Corporate debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 46 | 0 | 45 | 0
Net Realized and Unrealized Gains (Losses) Included in Income | 1 | 0 | 1 | 0
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0
Purchases, Sales, Issuances and Settlements, Net | 0 | 44 | 0 | 44
Gross Transfers In | 0 | 0 | 0 | 0
Gross Transfers Out | 0 | 0 | 0 | 0
Other | (3) | 0 | (2) | 0
Fair Value End of Period | 44 | 44 | 44 | 44
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 0 | 0 | 0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 | 0 | 0
Other bond securities | RMBS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 53 | 52 | 51 | 65
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 2 | 0 | 2
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0
Purchases, Sales, Issuances and Settlements, Net | (2) | (2) | 0 | (15)
Gross Transfers In | 0 | 0 | 0 | 0
Gross Transfers Out | (2) | 0 | (2) | 0
Other | 0 | 0 | 0 | 0
Fair Value End of Period | 49 | 52 | 49 | 52
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | (4) | 0 | (9)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 | 0 | 0
Other bond securities | CLO/ABS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 144 | 176 | 138 | 158
Net Realized and Unrealized Gains (Losses) Included in Income | 1 | (3) | 0 | 1
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0
Purchases, Sales, Issuances and Settlements, Net | (3) | (19) | 5 | (13)
Gross Transfers In | 2 | 0 | 2 | 0
Gross Transfers Out | 0 | 0 | 0 | (3)
Other | 1 | 0 | 0 | 11
Fair Value End of Period | 145 | 154 | 145 | 154
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 1 | (25) | (1) | (23)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 | 0 | 0
Equity securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 13 | 25 | 14 | 13
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 2 | 0 | 2
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0
Purchases, Sales, Issuances and Settlements, Net | 0 | 0 | 0 | 4
Gross Transfers In | 0 | 2 | 0 | 10
Gross Transfers Out | 0 | (1) | (1) | (1)
Other | 0 | 0 | 0 | 0
Fair Value End of Period | 13 | 28 | 13 | 28
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 2 | 1 | 2
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 | 0 | 0
Other invested assets |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 183 | 235 | 221 | 244
Net Realized and Unrealized Gains (Losses) Included in Income | (4) | 1 | (13) | (7)
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0
Purchases, Sales, Issuances and Settlements, Net | (36) | (9) | (39) | (10)
Gross Transfers In | 0 | 0 | 0 | 0
Gross Transfers Out | 0 | 0 | (13) | 0
Other | 2 | 0 | (11) | 0
Fair Value End of Period | 145 | 227 | 145 | 227
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | (1) | (3) | (12) | (10)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 | 0 | 0
Other assets |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 129 | 110 | 243 | 107
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0
Purchases, Sales, Issuances and Settlements, Net | 1 | 1 | (113) | 4
Gross Transfers In | 0 | 0 | 0 | 0
Gross Transfers Out | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Fair Value End of Period | 130 | 111 | 130 | 111
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 0 | 0 | 0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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