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v3.24.2

Fair value measurements (Assets, Measured At Fair Value Using Significant Unobservable Inputs) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
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 | $ 101 | $ 88 | $ 87 | $ 90
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 | 2 | (2) | (1) | (6)
Purchases, Assets | 1 | 4 | 19 | 11
Sales, Assets | (4) | (4) | (5) | (9)
Settlements, Assets | 0 | 0 | 0 | 0
Balance-End of Period, Assets | 100 | 86 | 100 | 86
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 1 | (3) | (1) | (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 | 5 | 7 | 3 | 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 | (1) | 0 | (1) | (1)
Net Realized Gains/ (Losses), Assets | 0 | 0 | 0 | 0
Purchases, Assets | 12 | (2) | 16 | 3
Sales, Assets | 0 | (2) | 0 | (2)
Settlements, Assets | (4) | 0 | (6) | 0
Balance-End of Period, Assets | 12 | 3 | 12 | 3
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 | (1) | 1 | (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 | 718 | 561 | 692 | 564
Transfers Into Level 3, Asset | 0 | 21 | 1 | 21
Transfers out of Level 3, Assets | (2) | 0 | (6) | 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets | (6) | 15 | 8 | 11
Net Realized Gains/ (Losses), Assets | (4) | (1) | (4) | (1)
Purchases, Assets | 83 | 62 | 155 | 105
Sales, Assets | (31) | (4) | (51) | (35)
Settlements, Assets | (126) | (5) | (163) | (16)
Balance-End of Period, Assets | 632 | 649 | 632 | 649
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 | (10) | 15 | 3 | 9
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 | 2,658 | 2,544 | 2,622 | 2,449
Transfers Into Level 3, Asset | 4 | 3 | 5 | 3
Transfers out of Level 3, Assets | 0 | (2) | (3) | (13)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 4 | 4 | 10 | 2
Net Realized Gains/ (Losses), Assets | (5) | (5) | (5) | (3)
Purchases, Assets | 326 | 118 | 469 | 323
Sales, Assets | (87) | (10) | (107) | (30)
Settlements, Assets | (191) | (128) | (282) | (207)
Balance-End of Period, Assets | 2,709 | 2,524 | 2,709 | 2,524
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (2) | (6) | (2) | (2)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | (1) | 3 | 5 | (2)
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 | 7 | 10 | 7 | 11
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 | 0 | 0
Purchases, Assets | 15 | 0 | 15 | 0
Sales, Assets | 0 | 0 | 0 | 0
Settlements, Assets | (2) | 0 | (2) | (1)
Balance-End of Period, Assets | 20 | 10 | 20 | 10
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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