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Fair value measurements (Assets, Measured At Fair Value Using Significant Unobservable Inputs) (Details) - Level 3 - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Equity Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | $ 125 | $ 100 | $ 120 | $ 87
Transfers Into Level 3, Asset | 0 |  | 0 | 0
Transfers out of Level 3, Assets | 0 | 0 | (1) | 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | 0 | 0
Net Realized Gains/ (Losses), Assets | (2) | 7 | (5) | 6
Purchases, Assets | 6 | 17 | 32 | 36
Sales, Assets | (15) | (6) | (32) | (11)
Settlements, Assets | 0 | 0 | 0 | 0
Balance-End of Period, Assets | 114 | 118 | 114 | 118
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 4 | 6 | 13 | 5
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | $ 0 | $ 0 | $ 0 | $ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other comprehensive income, before income tax | Other comprehensive income, before income tax | Other comprehensive income, before income tax | Other comprehensive income, before income tax
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | Revenues | Revenues
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | Revenues | Revenues
Short-term Investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | $ 42 | $ 12 | $ 14 | $ 3
Transfers Into Level 3, Asset | 0 |  | 0 | 0
Transfers out of Level 3, Assets | 0 | 0 | 0 | 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | (1) | 0 | (2)
Net Realized Gains/ (Losses), Assets | 0 | 0 | 0 | 0
Purchases, Assets | 2 | 6 | 32 | 22
Sales, Assets | (1) | (1) | (1) | (1)
Settlements, Assets | (1) | (1) | (3) | (7)
Balance-End of Period, Assets | 42 | 15 | 42 | 15
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 | $ (1) | $ 0 | $ (2)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other comprehensive income, before income tax | Other comprehensive income, before income tax | Other comprehensive income, before income tax | Other comprehensive income, before income tax
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | Revenues | Revenues
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | Revenues | Revenues
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 | $ 598 | $ 632 | $ 604 | $ 692
Transfers Into Level 3, Asset | 0 |  | 11 | 1
Transfers out of Level 3, Assets | (1) | (1) | (1) | (7)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 3 | 10 | 41 | 18
Net Realized Gains/ (Losses), Assets | 1 | (1) | (2) | (5)
Purchases, Assets | 66 | 59 | 210 | 214
Sales, Assets | (22) | (18) | (109) | (69)
Settlements, Assets | (43) | (42) | (152) | (205)
Balance-End of Period, Assets | 602 | 639 | 602 | 639
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | 0 | (1) | (1)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | $ 1 | $ 11 | $ 31 | $ 14
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other comprehensive income, before income tax | Other comprehensive income, before income tax | Other comprehensive income, before income tax | Other comprehensive income, before income tax
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | Revenues | Revenues
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | Revenues | Revenues
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 | $ 3,186 | $ 2,709 | $ 2,891 | $ 2,622
Transfers Into Level 3, Asset | 90 |  | 174 | 5
Transfers out of Level 3, Assets | (3) | 0 | (16) | (3)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 5 | 16 | (2) | 26
Net Realized Gains/ (Losses), Assets | (8) | (10) | (14) | (15)
Purchases, Assets | 212 | 316 | 726 | 785
Sales, Assets | (124) | (69) | (224) | (176)
Settlements, Assets | (119) | (184) | (296) | (466)
Balance-End of Period, Assets | 3,239 | 2,778 | 3,239 | 2,778
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 1 | (8) | (3) | (10)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | $ (1) | $ 12 | $ (18) | $ 17
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other comprehensive income, before income tax | Other comprehensive income, before income tax | Other comprehensive income, before income tax | Other comprehensive income, before income tax
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | Revenues | Revenues
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | Revenues | Revenues
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 | $ 0 | $ 20 | $ 3 | $ 7
Transfers Into Level 3, Asset | 0 |  | 0 | 0
Transfers out of Level 3, Assets | 0 | (14) | 0 | (14)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | 0 | 0
Net Realized Gains/ (Losses), Assets | 0 | 0 | (2) | 0
Purchases, Assets | 0 | 40 | 1 | 55
Sales, Assets | 0 | 0 | (2) | 0
Settlements, Assets | 0 | 0 | 0 | (2)
Balance-End of Period, Assets | 0 | 46 | 0 | 46
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
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other comprehensive income, before income tax | Other comprehensive income, before income tax | Other comprehensive income, before income tax | Other comprehensive income, before income tax
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | Revenues | Revenues
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | Revenues | Revenues

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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 (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: 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 Reference 5: 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 Reference 6: 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 Reference 7: 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 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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