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Fair value measurements (Assets and Liabilities, Measured At Fair Value Using Significant Unobservable Inputs) (Details) - Level 3 - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Equity Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance- Beginning of Period, Assets $ 81 $ 78 $ 77 $ 73
Transfers Into Level 3, Asset 0 0 1 0
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 3 1 7 8
Purchases, Assets 3 4 6 11
Sales, Assets (4) (4) (8) (13)
Settlements, Assets 0 0 0 0
Other, Assets 0 0 0 0
Balance-End of Period, Assets 83 79 83 79
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 3 (1) 6 5
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets 0 0 0 0
Short-term Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance- Beginning of Period, Assets 9 3 7 5
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 0 0
Net Realized Gains/ (Losses), Assets (1) 0 (1) 0
Purchases, Assets 1 7 8 10
Sales, Assets 0 0 0 0
Settlements, Assets (6) 0 (11) (5)
Other, Assets 0 0 0 0
Balance-End of Period, Assets 3 10 3 10
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets (1) 0 (1) 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets 0 0 0 0
Other Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance- Beginning of Period, Assets   10   10
Transfers Into Level 3, Asset   0   0
Transfers out of Level 3, Assets   (10)   (10)
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   0   0
Other, Assets   0   0
Balance-End of Period, Assets   0   0
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
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 549 642 633 546
Transfers Into Level 3, Asset 0 22 23 22
Transfers out of Level 3, Assets 0 0 (23) (10)
Change in Net Unrealized Gains (Losses) included in OCI, Assets (34) (15) (88) (2)
Net Realized Gains/ (Losses), Assets (4) (3) (6) 0
Purchases, Assets 39 60 108 235
Sales, Assets (19) (19) (44) (35)
Settlements, Assets (25) (27) (97) (96)
Other, Assets 0 0 0 0
Balance-End of Period, Assets 506 660 506 660
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets (1) 0 (3) 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets (35) (15) (89) 2
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 2,261 1,688 2,049 1,573
Transfers Into Level 3, Asset 2 45 41 91
Transfers out of Level 3, Assets (4) 0 (97) (3)
Change in Net Unrealized Gains (Losses) included in OCI, Assets (16) 2 (68) 14
Net Realized Gains/ (Losses), Assets (9) 0 (9) 3
Purchases, Assets 164 272 658 681
Sales, Assets (8) (13) (59) (88)
Settlements, Assets (94) (135) (219) (412)
Other, Assets 0 0 0 0
Balance-End of Period, Assets 2,296 1,859 2,296 1,859
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets (3) 0 (4) 3
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets (19) 0 (71) 17
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 19 47 26 60
Transfers Into Level 3, Asset 0 0 0 0
Transfers out of Level 3, Assets 0 0 (5) 0
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 4 17 4 18
Sales, Assets 0 0 0 (1)
Settlements, Assets (4) (11) (6) (24)
Other, Assets 0 0 0 0
Balance-End of Period, Assets 19 53 19 53
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
Guaranteed Minimum Income Benefit [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance - Beginning of Period, Liabilities 832 [1] 760 [2] 745 [2] 1,089 [2]
Transfers into level 3, liability 0 0 0 0
Transfers out of Level 3, Liabilities 0 0 0 0
Change in Net Unrealized Gains (losses) included in OCI, Liabilities 0 0 0 0
Net Realized Gains/(Losses), Liabilities (22) [1] 59 [2] 86 [2] (252) [2]
Purchases, Liabilities 0 0 0 0
Sales, Liabilities 0 0 0 0
Settlements, Liabilities 0 0 0 0
Other, Liabilities (26) [1] (1) [2] (47) [2] (19) [2]
Balance - End of Period, Liabilities 784 [1] 818 [2] 784 [1] 818 [2]
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities (22) [1] 59 [2] 86 [2] (252) [2]
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Liabilities $ 0 $ 0 $ 0 $ 0
[1] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
[2] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.