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Fair value measurements (Assets and Liabilities, Measured At Fair Value Using Significant Unobservable Inputs) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 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 income (loss), before income tax Other comprehensive income (loss), before income tax
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues Revenues
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues Revenues
Level 3 | Equity Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance- Beginning of Period, Assets $ 90 $ 77
Transfers Into Level 3, Asset   1
Transfers out of Level 3, Assets 0 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets 0 0
Net Realized Gains/ (Losses), Assets (4) 4
Purchases, Assets 7 3
Sales, Assets (5) (3)
Settlements, Assets 0 0
Balance-End of Period, Assets 88 82
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets (3) 4
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets 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 7
Transfers Into Level 3, Asset   0
Transfers out of Level 3, Assets 0 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets (1) 0
Net Realized Gains/ (Losses), Assets 0 0
Purchases, Assets 5 2
Sales, Assets 0 0
Settlements, Assets 0 (5)
Balance-End of Period, Assets 7 4
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 0 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets (1) 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 564 633
Transfers Into Level 3, Asset   18
Transfers out of Level 3, Assets 0 (23)
Change in Net Unrealized Gains (Losses) included in OCI, Assets (4) (13)
Net Realized Gains/ (Losses), Assets 0 (2)
Purchases, Assets 43 43
Sales, Assets (31) (6)
Settlements, Assets (11) (32)
Balance-End of Period, Assets 561 618
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 0 (2)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets (6) (13)
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 2,449 2,049
Transfers Into Level 3, Asset   29
Transfers out of Level 3, Assets (11) (50)
Change in Net Unrealized Gains (Losses) included in OCI, Assets (2) (22)
Net Realized Gains/ (Losses), Assets 2 0
Purchases, Assets 205 315
Sales, Assets (20) (27)
Settlements, Assets (79) (65)
Balance-End of Period, Assets 2,544 2,229
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 4 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets (5) (22)
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 11 26
Transfers Into Level 3, Asset   0
Transfers out of Level 3, Assets 0 (5)
Change in Net Unrealized Gains (Losses) included in OCI, Assets 0 0
Net Realized Gains/ (Losses), Assets 0 0
Purchases, Assets 0 0
Sales, Assets 0 0
Settlements, Assets (1) (1)
Balance-End of Period, Assets 10 20
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 0 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets $ 0 $ 0