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Fair value measurements (Assets, Measured At Fair Value Using Significant Unobservable Inputs) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 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
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 | $ 87 | $ 90
Transfers Into Level 3, Asset | 0 |
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 | (3) | (4)
Purchases, Assets | 18 | 7
Sales, Assets | (1) | (5)
Settlements, Assets | 0 | 0
Balance-End of Period, Assets | 101 | 88
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (2) | (3)
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 | 3
Transfers Into Level 3, Asset | 0 |
Transfers out of Level 3, Assets | 0 | 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | (1)
Net Realized Gains/ (Losses), Assets | 0 | 0
Purchases, Assets | 4 | 5
Sales, Assets | 0 | 0
Settlements, Assets | (2) | 0
Balance-End of Period, Assets | 5 | 7
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 | (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 | 692 | 564
Transfers Into Level 3, Asset | 1 |
Transfers out of Level 3, Assets | (4) | 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 14 | (4)
Net Realized Gains/ (Losses), Assets | 0 | 0
Purchases, Assets | 72 | 43
Sales, Assets | (20) | (31)
Settlements, Assets | (37) | (11)
Balance-End of Period, Assets | 718 | 561
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 | 13 | (6)
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 | 2,622 | 2,449
Transfers Into Level 3, Asset | 1 |
Transfers out of Level 3, Assets | (3) | (11)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 6 | (2)
Net Realized Gains/ (Losses), Assets | 0 | 2
Purchases, Assets | 143 | 205
Sales, Assets | (20) | (20)
Settlements, Assets | (91) | (79)
Balance-End of Period, Assets | 2,658 | 2,544
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | 4
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 6 | (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 | 7 | 11
Transfers Into Level 3, Asset | 0 |
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 | 0 | 0
Purchases, Assets | 0 | 0
Sales, Assets | 0 | 0
Settlements, Assets | 0 | (1)
Balance-End of Period, Assets | 7 | 10
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

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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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