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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