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v3.23.3

Fair value measurements (Assets, Measured At Fair Value Using Significant Unobservable Inputs) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other comprehensive loss, before income tax | Other comprehensive loss, before income tax | Other comprehensive loss, before income tax | Other comprehensive loss, before income tax
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Total revenues | Total revenues | Total revenues | Total revenues
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Total revenues | Total revenues | Total revenues
Level 3 | Equity Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | $ 86 | $ 81 | $ 90 | $ 77
Transfers Into Level 3, Asset | 0 | 0 | 0 | 1
Transfers out of Level 3, Assets | 0 | 0 | 0 | 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | 0 | 0
Net Realized Gains/ (Losses), Assets | 0 | 3 | (6) | 7
Purchases, Assets | 4 | 3 | 15 | 6
Sales, Assets | (5) | (4) | (14) | (8)
Settlements, Assets | 0 | 0 | 0 | 0
Balance-End of Period, Assets | 85 | 83 | 85 | 83
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | 3 | (6) | 6
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 | 0 | 0 | 0
Level 3 | Short-term Investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | 3 | 9 | 3 | 7
Transfers Into Level 3, Asset | 0 | 0 | 0 | 0
Transfers out of Level 3, Assets | 0 | 0 | 0 | 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | (1) | 0
Net Realized Gains/ (Losses), Assets | 0 | (1) | 0 | (1)
Purchases, Assets | 0 | 1 | 3 | 8
Sales, Assets | (1) | 0 | (3) | 0
Settlements, Assets | 0 | (6) | 0 | (11)
Balance-End of Period, Assets | 2 | 3 | 2 | 3
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | (1) | 0 | (1)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 | 0 | 0 | 0
Level 3 | Available-for-Sale Debt Securities | Non-U.S. |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | 649 | 549 | 564 | 633
Transfers Into Level 3, Asset | 0 | 0 | 21 | 23
Transfers out of Level 3, Assets | (22) | 0 | (22) | (23)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | (6) | (34) | 5 | (88)
Net Realized Gains/ (Losses), Assets | (2) | (4) | (3) | (6)
Purchases, Assets | 46 | 39 | 151 | 108
Sales, Assets | (17) | (19) | (52) | (44)
Settlements, Assets | (15) | (25) | (31) | (97)
Balance-End of Period, Assets | 633 | 506 | 633 | 506
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (1) | (1) | (1) | (3)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | (8) | (35) | 1 | (89)
Level 3 | Available-for-Sale Debt Securities | Corporate and asset-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | 2,524 | 2,261 | 2,449 | 2,049
Transfers Into Level 3, Asset | 0 | 2 | 3 | 41
Transfers out of Level 3, Assets | (10) | (4) | (23) | (97)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 6 | (16) | 8 | (68)
Net Realized Gains/ (Losses), Assets | (4) | (9) | (7) | (9)
Purchases, Assets | 158 | 164 | 481 | 658
Sales, Assets | (40) | (8) | (70) | (59)
Settlements, Assets | (65) | (94) | (272) | (219)
Balance-End of Period, Assets | 2,569 | 2,296 | 2,569 | 2,296
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (4) | (3) | (6) | (4)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 4 | (19) | 2 | (71)
Level 3 | Available-for-Sale Debt Securities | Mortgage-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | 10 | 19 | 11 | 26
Transfers Into Level 3, Asset | 0 | 0 | 0 | 0
Transfers out of Level 3, Assets | 0 | 0 | 0 | (5)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | 0 | 0
Net Realized Gains/ (Losses), Assets | 0 | 0 | 0 | 0
Purchases, Assets | 16 | 4 | 16 | 4
Sales, Assets | 0 | 0 | 0 | 0
Settlements, Assets | (1) | (4) | (2) | (6)
Balance-End of Period, Assets | 25 | 19 | 25 | 19
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | 0 | 0 | 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | $ 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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- Definition Indicates line item in statement in which net income is reported that includes unrealized gain (loss) from asset measured at fair value 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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- 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/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 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/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/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 purchases 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -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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- Definition Amount of sale 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -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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- Definition Amount of settlement 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -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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- Definition Amount of transfer of financial instrument classified as an asset 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 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 an asset 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 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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