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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Equity securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance- Beginning of year, assets | $ 77 | $ 73 | $ 69
Transfers into Level 3, assets | 1 | 0 | 0
Transfers out of Level 3, assets | 0 | 0 | (3)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | 0
Net Realized Gains/Losses, Assets | 15 | 8 | 1
Purchased, assets | 9 | 21 | 23
Sales, assets | (12) | (25) | (17)
Settlements, assets | 0 | 0 | 0
Other, assets | 0 | 0 | 0
Balance- End of year, assets | 90 | 77 | 73
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 14 | 5 | 4
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 | 7 | 5 | 6
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 | 0 | (1) | 0
Net Realized Gains/Losses, Assets | (2) | 0 | (1)
Purchased, assets | 3 | 9 | 14
Sales, assets | 0 | 0 | (2)
Settlements, assets | (5) | (6) | (12)
Other, assets | 0 | 0 | 0
Balance- End of year, assets | 3 | 7 | 5
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (1) | 0 | 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 | 10
Transfers into Level 3, assets |  | 0 | 0
Transfers out of Level 3, assets |  | (10) | 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets |  | 0 | 0
Net Realized Gains/Losses, Assets |  | 0 | 0
Purchased, assets |  | 0 | 0
Sales, assets |  | 0 | 0
Settlements, assets |  | 0 | 0
Other, assets |  | 0 | 0
Balance- End of year, assets |  | 0 | 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
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 | 633 | 546 | 449
Transfers into Level 3, assets | 23 | 24 | 0
Transfers out of Level 3, assets | (23) | (11) | (16)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | (53) | (30) | 19
Net Realized Gains/Losses, Assets | (6) | (1) | (1)
Purchased, assets | 156 | 275 | 274
Sales, assets | (59) | (48) | (122)
Settlements, assets | (107) | (122) | (57)
Other, assets | 0 | 0 | 0
Balance- End of year, assets | 564 | 633 | 546
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (2) | 0 | 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | (53) | (25) | 16
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 | 2,049 | 1,573 | 1,451
Transfers into Level 3, assets | 47 | 91 | 134
Transfers out of Level 3, assets | (97) | (76) | (73)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | (80) | 15 | (8)
Net Realized Gains/Losses, Assets | (14) | (2) | (30)
Purchased, assets | 921 | 1,154 | 708
Sales, assets | (85) | (99) | (186)
Settlements, assets | (292) | (607) | (423)
Other, assets | 0 | 0 | 0
Balance- End of year, assets | 2,449 | 2,049 | 1,573
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (9) | 3 | (5)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | (84) | 17 | (6)
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 | 26 | 60 | 60
Transfers into Level 3, assets | 0 | 0 | 0
Transfers out of Level 3, assets | (9) | (18) | (1)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | 0
Net Realized Gains/Losses, Assets | 0 | 0 | 0
Purchased, assets | 4 | 18 | 2
Sales, assets | 0 | (1) | 0
Settlements, assets | (10) | (33) | (1)
Other, assets | 0 | 0 | 0
Balance- End of year, assets | 11 | 26 | 60
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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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