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Fair value measurements (Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - Level 3 - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Equity securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance- Beginning of year, assets | $ 90 | $ 77 | $ 73
Transfers into Level 3, assets | 0 | 1 | 0
Transfers out of Level 3, assets | 0 | 0 | 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | 0
Net Realized Gains/Losses, Assets | (7) | 15 | 8
Purchased, assets | 24 | 9 | 21
Sales, assets | (20) | (12) | (25)
Settlements, assets | 0 | 0 | 0
Balance- End of year, assets | 87 | 90 | 77
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (7) | 14 | 5
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 | 0 | 0
Short-term investments |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance- Beginning of year, assets | 3 | 7 | 5
Transfers into Level 3, assets | 0 | 0 | 0
Transfers out of Level 3, assets | 0 | 0 | 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets | (1) | 0 | (1)
Net Realized Gains/Losses, Assets | (1) | (2) | 0
Purchased, assets | 5 | 3 | 9
Sales, assets | (3) | 0 | 0
Settlements, assets | 0 | (5) | (6)
Balance- End of year, assets | 3 | 3 | 7
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | (1) | 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 | 0 | 0
Other investments |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance- Beginning of year, assets |  | 0 | 10
Transfers into Level 3, assets |  |  | 0
Transfers out of Level 3, assets |  |  | (10)
Change in Net Unrealized Gains (Losses) included in OCI, Assets |  |  | 0
Net Realized Gains/Losses, Assets |  |  | 0
Purchased, assets |  |  | 0
Sales, assets |  |  | 0
Settlements, assets |  |  | 0
Balance- End of year, assets |  |  | 0
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets |  |  | 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets |  |  | 0
Available-for-sale Securities [Member] | Non-U.S. |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance- Beginning of year, assets | 564 | 633 | 546
Transfers into Level 3, assets | 21 | 23 | 24
Transfers out of Level 3, assets | (22) | (23) | (11)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 13 | (53) | (30)
Net Realized Gains/Losses, Assets | (4) | (6) | (1)
Purchased, assets | 258 | 156 | 275
Sales, assets | (82) | (59) | (48)
Settlements, assets | (56) | (107) | (122)
Balance- End of year, assets | 692 | 564 | 633
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (1) | (2) | 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 7 | (53) | (25)
Available-for-sale Securities [Member] | Corporate and asset-backed securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance- Beginning of year, assets | 2,449 | 2,049 | 1,573
Transfers into Level 3, assets | 30 | 47 | 91
Transfers out of Level 3, assets | (26) | (97) | (76)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 28 | (80) | 15
Net Realized Gains/Losses, Assets | (17) | (14) | (2)
Purchased, assets | 681 | 921 | 1,154
Sales, assets | (81) | (85) | (99)
Settlements, assets | (442) | (292) | (607)
Balance- End of year, assets | 2,622 | 2,449 | 2,049
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (5) | (9) | 3
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 12 | (84) | 17
Available-for-sale Securities [Member] | Mortgage-backed securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance- Beginning of year, assets | 11 | 26 | 60
Transfers into Level 3, assets | 0 | 0 | 0
Transfers out of Level 3, assets | (15) | (9) | (18)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | 0
Net Realized Gains/Losses, Assets | 0 | 0 | 0
Purchased, assets | 15 | 4 | 18
Sales, assets | 0 | 0 | (1)
Settlements, assets | (4) | (10) | (33)
Balance- End of year, assets | 7 | 11 | 26
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | 0 | 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | $ 0 | $ 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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