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Fair Value Measurements (excluding Consolidated Investment Entities) - Level 3 Financial Instruments (Details) - Level 3 - Measured at fair value on a recurring basis - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Managed custody guarantees |  |  |  |
Derivatives Rollforward: |  |  |  |
Fair Value, Derivatives, beginning balance | $ (13) | $ (10) |  |
Gains (losses) from standalone derivatives recognized in Net gains (losses) | 5 | 0 |  |
Total Realized/Unrealized Gains (Losses) Included in OCI | 0 | 0 |  |
Purchases | 0 | 0 |  |
Issuances | 0 | 0 |  |
Sales | 0 | 0 |  |
Settlements | 2 | 0 |  |
Transfers in to Level 3 | 0 | 0 |  |
Transfers out of Level 3 | 0 | 0 |  |
Change In Unrealized Gains (Losses) Included in Earnings | 0 | 0 |  |
Change In Unrealized Gains (Losses) Included in OCI | 0 | 0 |  |
Embedded derivatives within reinsurance |  |  |  |
Derivatives Rollforward: |  |  |  |
Fair Value, Derivatives, beginning balance | (42) | (57) | $ (53) | $ (58)
Gains (losses) from standalone derivatives recognized in Net gains (losses) | 0 | (1) | 11 | 0
Total Realized/Unrealized Gains (Losses) Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 6 | 0 | 6
Transfers in to Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Fair Value, Derivatives, ending balance | (42) | (52) | (42) | (52)
Change In Unrealized Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0
Change In Unrealized Gains (Losses) Included in OCI | 0 | 0 | 0 | 0
Short-term investments and cash equivalents |  |  |  |
Derivatives Rollforward: |  |  |  |
Fair Value, Derivatives, beginning balance | 25 |  | 23 |
Gains (losses) from standalone derivatives recognized in Net gains (losses) | 1 |  | 1 |
Total Realized/Unrealized Gains (Losses) Included in OCI | (1) |  | 1 |
Purchases | 0 |  | 0 |
Issuances | 0 |  | 0 |
Sales | 0 |  | 0 |
Settlements | (15) |  | (15) |
Transfers in to Level 3 | 0 |  | 0 |
Transfers out of Level 3 | 0 |  | 0 |
Fair Value, Derivatives, ending balance | 10 |  | 10 |
Change In Unrealized Gains (Losses) Included in Earnings | 0 |  | 0 |
Change In Unrealized Gains (Losses) Included in OCI | (2) |  | 0 |
Fixed maturities |  |  |  |
Assets Rollforward: |  |  |  |
Fair Value, Assets, beginning balance | 2,613 | 2,010 | 2,127 | 2,090
Total Realized/Unrealized Gains (Losses) Included in Net income | 1 | 2 | (51) | (3)
Total Realized/Unrealized Gains (Losses) Included in OCI | 22 | 60 | 106 | 27
Purchases | 419 | 175 | 1,010 | 318
Issuances | 0 | 0 | 0 | 0
Sales | (46) | (21) | (66) | (18)
Settlements | (170) | (85) | (308) | (254)
Transfers in to Level 3 | 0 | 0 | 0 | 51
Transfers out of Level 3 | (35) | (107) | (14) | (177)
Fair Value, Assets, ending balance | 2,804 | 2,034 | 2,804 | 2,034
Change In Unrealized Gains (Losses) Included in Earnings | (1) | 8 | (22) | 3
Derivatives Rollforward: |  |  |  |
Change In Unrealized Gains (Losses) Included in OCI | 24 | 56 | 102 | 19
US Government Agencies Debt Securities |  |  |  |
Assets Rollforward: |  |  |  |
Fair Value, Assets, beginning balance |  |  |  | 1
Total Realized/Unrealized Gains (Losses) Included in Net income |  |  |  | 0
Total Realized/Unrealized Gains (Losses) Included in OCI |  |  |  | 0
Purchases |  |  |  | 0
Issuances |  |  |  | 0
Sales |  |  |  | 0
Settlements |  |  |  | 0
Transfers in to Level 3 |  |  |  | 0
Transfers out of Level 3 |  |  |  | (1)
Fair Value, Assets, ending balance |  | 0 |  | 0
Change In Unrealized Gains (Losses) Included in Earnings |  |  |  | 0
Derivatives Rollforward: |  |  |  |
Change In Unrealized Gains (Losses) Included in OCI |  |  |  | 0
U.S. corporate public securities |  |  |  |
Assets Rollforward: |  |  |  |
Fair Value, Assets, beginning balance | 48 | 12 | 59 | 18
Total Realized/Unrealized Gains (Losses) Included in Net income | 0 | 0 | (1) | 0
Total Realized/Unrealized Gains (Losses) Included in OCI | 1 | (1) | 2 | 0
Purchases | 15 | 0 | 15 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | (10) | 0
Settlements | 0 | 0 | 0 | (7)
Transfers in to Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (1) | 0 | (2) | 0
Fair Value, Assets, ending balance | 63 | 11 | 63 | 11
Change In Unrealized Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0
Derivatives Rollforward: |  |  |  |
Change In Unrealized Gains (Losses) Included in OCI | 0 | (1) | 1 | (1)
U.S. corporate private securities |  |  |  |
Assets Rollforward: |  |  |  |
Fair Value, Assets, beginning balance | 1,675 | 1,464 | 1,497 | 1,526
Total Realized/Unrealized Gains (Losses) Included in Net income | 0 | (4) | 2 | (5)
Total Realized/Unrealized Gains (Losses) Included in OCI | 18 | 58 | 52 | 36
Purchases | 235 | 118 | 504 | 240
Issuances | 0 | 0 | 0 | 0
Sales | (33) | (3) | (42) | (9)
Settlements | (94) | (81) | (212) | (196)
Transfers in to Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | (107) | 0 | (147)
Fair Value, Assets, ending balance | 1,801 | 1,445 | 1,801 | 1,445
Change In Unrealized Gains (Losses) Included in Earnings | 1 | 2 | 1 | 1
Derivatives Rollforward: |  |  |  |
Change In Unrealized Gains (Losses) Included in OCI | 18 | 54 | 50 | 29
Foreign corporate public securities and foreign governments |  |  |  |
Assets Rollforward: |  |  |  |
Fair Value, Assets, beginning balance | 62 | 17 | 60 | 0
Total Realized/Unrealized Gains (Losses) Included in Net income | 0 | 0 | 0 | 0
Total Realized/Unrealized Gains (Losses) Included in OCI | 2 | 1 | 1 | 0
Purchases | 0 | 10 | 0 | 10
Issuances | 0 | 0 | 0 | 0
Sales | 0 | (18) | 0 | 0
Settlements | 0 | 0 | 0 | 0
Transfers in to Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (3) | 0 | 0 | 0
Fair Value, Assets, ending balance | 61 | 10 | 61 | 10
Change In Unrealized Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0
Derivatives Rollforward: |  |  |  |
Change In Unrealized Gains (Losses) Included in OCI | 2 | 0 | 1 | 0
Foreign corporate private securities |  |  |  |
Assets Rollforward: |  |  |  |
Fair Value, Assets, beginning balance | 636 | 444 | 421 | 436
Total Realized/Unrealized Gains (Losses) Included in Net income | 3 | 2 | (47) | 2
Total Realized/Unrealized Gains (Losses) Included in OCI | 1 | 2 | 50 | (9)
Purchases | 34 | 22 | 266 | 43
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | (9)
Settlements | (73) | (2) | (89) | (46)
Transfers in to Level 3 | 0 | 0 | 0 | 51
Transfers out of Level 3 | 0 | 0 | 0 | 0
Fair Value, Assets, ending balance | 601 | 468 | 601 | 468
Change In Unrealized Gains (Losses) Included in Earnings | 0 | 1 | (18) | 1
Derivatives Rollforward: |  |  |  |
Change In Unrealized Gains (Losses) Included in OCI | 4 | 3 | 49 | (9)
Residential mortgage-backed securities |  |  |  |
Assets Rollforward: |  |  |  |
Fair Value, Assets, beginning balance | 98 | 49 | 67 | 57
Total Realized/Unrealized Gains (Losses) Included in Net income | (2) | 4 | (5) | 0
Total Realized/Unrealized Gains (Losses) Included in OCI | (1) | 0 | 0 | 0
Purchases | 0 | 13 | 17 | 13
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Transfers in to Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (26) | 0 | (10) | (4)
Fair Value, Assets, ending balance | 69 | 66 | 69 | 66
Change In Unrealized Gains (Losses) Included in Earnings | (2) | 5 | (5) | 1
Derivatives Rollforward: |  |  |  |
Change In Unrealized Gains (Losses) Included in OCI | (1) | 0 | 0 | 0
Other asset-backed securities |  |  |  |
Assets Rollforward: |  |  |  |
Fair Value, Assets, beginning balance | 94 | 24 | 23 | 52
Total Realized/Unrealized Gains (Losses) Included in Net income | 0 | 0 | 0 | 0
Total Realized/Unrealized Gains (Losses) Included in OCI | 1 | 0 | 1 | 0
Purchases | 135 | 12 | 208 | 12
Issuances | 0 | 0 | 0 | 0
Sales | (13) | 0 | (14) | 0
Settlements | (3) | (2) | (7) | (5)
Transfers in to Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | (5) | 0 | (2) | (25)
Fair Value, Assets, ending balance | 209 | 34 | 209 | 34
Change In Unrealized Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0
Derivatives Rollforward: |  |  |  |
Change In Unrealized Gains (Losses) Included in OCI | 1 | 0 | 1 | 0
Equity securities, at fair value |  |  |  |
Assets Rollforward: |  |  |  |
Fair Value, Assets, beginning balance | 95 | 98 | 98 | 96
Total Realized/Unrealized Gains (Losses) Included in Net income | (1) | 4 | 1 | 6
Total Realized/Unrealized Gains (Losses) Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 9 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | (14) | 0
Settlements | 0 | 0 | 0 | 0
Transfers in to Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Fair Value, Assets, ending balance | 94 | 102 | 94 | 102
Change In Unrealized Gains (Losses) Included in Earnings | (1) | 4 | 2 | 6
Derivatives Rollforward: |  |  |  |
Change In Unrealized Gains (Losses) Included in OCI | 0 | 0 | 0 | 0
Contingent Consideration |  |  |  |
Liabilities Rollforward: |  |  |  |
Fair Value, Liabilities, Ending Balance | (154) | (49) | (2) | (51)
Total Realized/Unrealized Gains (Losses) Included in Net income | 0 | 0 | (4) | 0
Total Realized/Unrealized Gains (Losses) Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | (149) | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 14 | 1 | 16
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Fair Value, Liabilities, Ending Balance | (154) | (35) | (154) | (35)
Change In Unrealized Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0
Derivatives Rollforward: |  |  |  |
Change In Unrealized Gains (Losses) Included in OCI | 0 | 0 | 0 | 0
Managed custody guarantees |  |  |  |
Liabilities Rollforward: |  |  |  |
Fair Value, Liabilities, Ending Balance |  |  | (19) | (9)
Total Realized/Unrealized Gains (Losses) Included in Net income |  |  | 12 | 0
Total Realized/Unrealized Gains (Losses) Included in OCI |  |  | 0 | 0
Purchases |  |  | 0 | 0
Issuances |  |  | (1) | (1)
Sales |  |  | 0 | 0
Settlements |  |  | 2 | 0
Transfers into Level 3 |  |  | 0 | 0
Transfers out of Level 3 |  |  | 0 | 0
Fair Value, Liabilities, Ending Balance | (6) | (10) | (6) | (10)
Change In Unrealized Gains (Losses) Included in Earnings |  |  | 0 | 0
Derivatives Rollforward: |  |  |  |
Change In Unrealized Gains (Losses) Included in OCI |  |  | 0 | 0
Assets held in separate accounts |  |  |  |
Assets Rollforward: |  |  |  |
Fair Value, Assets, beginning balance | 347 | 363 | 340 | 348
Total Realized/Unrealized Gains (Losses) Included in Net income | 2 | 11 | 8 | 12
Total Realized/Unrealized Gains (Losses) Included in OCI | 0 | 0 | 0 | 0
Purchases | 36 | 12 | 57 | 47
Issuances | 0 | 0 | 0 | 0
Sales | (10) | (9) | (27) | (24)
Settlements | 0 | 0 | 0 | 0
Transfers in to Level 3 | 0 | 0 | 0 | 5
Transfers out of Level 3 | (3) | (29) | (6) | (40)
Fair Value, Assets, ending balance | 372 | 348 | 372 | 348
Change In Unrealized Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0
Derivatives Rollforward: |  |  |  |
Change In Unrealized Gains (Losses) Included in OCI | $ 0 | $ 0 | $ 0 | $ 0

X
- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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- Definition Amount of unrealized gain (loss) recognized in income 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/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: 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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- Definition Amount of unrealized gain (loss) recognized in income from liability 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 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: 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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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2G -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2G Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2G -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2G Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2G -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2G Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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