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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