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v3.25.2

Fair value measurements (Assets, Measured At Fair Value Using Significant Unobservable Inputs) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
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 | 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 | Revenues | Revenues
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | Revenues | Revenues
Level 3 | Equity Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | $ 113 | $ 101 | $ 120 | $ 87
Transfers Into Level 3, Asset | 0 | 0 | 0 | 0
Transfers out of Level 3, Assets | (1) | 0 | (1) | 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | 0 | 0
Net Realized Gains/ (Losses), Assets | 2 | 2 | (3) | (1)
Purchases, Assets | 19 | 1 | 26 | 19
Sales, Assets | (8) | (4) | (17) | (5)
Settlements, Assets | 0 | 0 | 0 | 0
Balance-End of Period, Assets | 125 | 100 | 125 | 100
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 4 | 1 | 9 | (1)
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 | 18 | 5 | 14 | 3
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 | (1) | 0 | (1)
Net Realized Gains/ (Losses), Assets | 0 | 0 | 0 | 0
Purchases, Assets | 25 | 12 | 30 | 16
Sales, Assets | 0 | 0 | 0 | 0
Settlements, Assets | (1) | (4) | (2) | (6)
Balance-End of Period, Assets | 42 | 12 | 42 | 12
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 | (1)
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 | 587 | 718 | 604 | 692
Transfers Into Level 3, Asset | 10 | 0 | 11 | 1
Transfers out of Level 3, Assets | 0 | (2) | 0 | (6)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 18 | (6) | 38 | 8
Net Realized Gains/ (Losses), Assets | 3 | (4) | (3) | (4)
Purchases, Assets | 84 | 83 | 144 | 155
Sales, Assets | (34) | (31) | (87) | (51)
Settlements, Assets | (70) | (126) | (109) | (163)
Balance-End of Period, Assets | 598 | 632 | 598 | 632
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | (1) | (1) | (1)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 16 | (10) | 30 | 3
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 | 3,017 | 2,658 | 2,891 | 2,622
Transfers Into Level 3, Asset | 60 | 4 | 84 | 5
Transfers out of Level 3, Assets | (12) | 0 | (13) | (3)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | (3) | 4 | (7) | 10
Net Realized Gains/ (Losses), Assets | (4) | (5) | (6) | (5)
Purchases, Assets | 295 | 326 | 514 | 469
Sales, Assets | (53) | (87) | (100) | (107)
Settlements, Assets | (114) | (191) | (177) | (282)
Balance-End of Period, Assets | 3,186 | 2,709 | 3,186 | 2,709
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (1) | (2) | (4) | (2)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | (7) | (1) | (17) | 5
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 | 0 | 7 | 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 | 0 | 0
Net Realized Gains/ (Losses), Assets | 0 | 0 | (2) | 0
Purchases, Assets | 0 | 15 | 1 | 15
Sales, Assets | 0 | 0 | (2) | 0
Settlements, Assets | 0 | (2) | 0 | (2)
Balance-End of Period, Assets | 0 | 20 | 0 | 20
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

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