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Fair value measurements (Assets and Liabilities, Measured At Fair Value Using Significant Unobservable Inputs) (Details) - Level 3 - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Equity Securities |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets | $ 81 |  | $ 78 |  | $ 77 |  | $ 73 |
Transfers Into Level 3, Asset | 0 |  | 0 |  | 1 |  | 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 | 3 |  | 1 |  | 7 |  | 8 |
Purchases, Assets | 3 |  | 4 |  | 6 |  | 11 |
Sales, Assets | (4) |  | (4) |  | (8) |  | (13) |
Settlements, Assets | 0 |  | 0 |  | 0 |  | 0 |
Other, Assets | 0 |  | 0 |  | 0 |  | 0 |
Balance-End of Period, Assets | 83 |  | 79 |  | 83 |  | 79 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 3 |  | (1) |  | 6 |  | 5 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 |  | 0 |  | 0 |  | 0 |
Short-term Investments |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets | 9 |  | 3 |  | 7 |  | 5 |
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 | (1) |  | 0 |  | (1) |  | 0 |
Purchases, Assets | 1 |  | 7 |  | 8 |  | 10 |
Sales, Assets | 0 |  | 0 |  | 0 |  | 0 |
Settlements, Assets | (6) |  | 0 |  | (11) |  | (5) |
Other, Assets | 0 |  | 0 |  | 0 |  | 0 |
Balance-End of Period, Assets | 3 |  | 10 |  | 3 |  | 10 |
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 | 0 |  | 0 |  | 0 |  | 0 |
Other Investments |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets |  |  | 10 |  |  |  | 10 |
Transfers Into Level 3, Asset |  |  | 0 |  |  |  | 0 |
Transfers out of Level 3, Assets |  |  | (10) |  |  |  | (10) |
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 |  |  |  | 0 |
Other, Assets |  |  | 0 |  |  |  | 0 |
Balance-End of Period, Assets |  |  | 0 |  |  |  | 0 |
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 Debt Securities | Non-U.S. |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets | 549 |  | 642 |  | 633 |  | 546 |
Transfers Into Level 3, Asset | 0 |  | 22 |  | 23 |  | 22 |
Transfers out of Level 3, Assets | 0 |  | 0 |  | (23) |  | (10) |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | (34) |  | (15) |  | (88) |  | (2) |
Net Realized Gains/ (Losses), Assets | (4) |  | (3) |  | (6) |  | 0 |
Purchases, Assets | 39 |  | 60 |  | 108 |  | 235 |
Sales, Assets | (19) |  | (19) |  | (44) |  | (35) |
Settlements, Assets | (25) |  | (27) |  | (97) |  | (96) |
Other, Assets | 0 |  | 0 |  | 0 |  | 0 |
Balance-End of Period, Assets | 506 |  | 660 |  | 506 |  | 660 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (1) |  | 0 |  | (3) |  | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | (35) |  | (15) |  | (89) |  | 2 |
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 | 2,261 |  | 1,688 |  | 2,049 |  | 1,573 |
Transfers Into Level 3, Asset | 2 |  | 45 |  | 41 |  | 91 |
Transfers out of Level 3, Assets | (4) |  | 0 |  | (97) |  | (3) |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | (16) |  | 2 |  | (68) |  | 14 |
Net Realized Gains/ (Losses), Assets | (9) |  | 0 |  | (9) |  | 3 |
Purchases, Assets | 164 |  | 272 |  | 658 |  | 681 |
Sales, Assets | (8) |  | (13) |  | (59) |  | (88) |
Settlements, Assets | (94) |  | (135) |  | (219) |  | (412) |
Other, Assets | 0 |  | 0 |  | 0 |  | 0 |
Balance-End of Period, Assets | 2,296 |  | 1,859 |  | 2,296 |  | 1,859 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (3) |  | 0 |  | (4) |  | 3 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | (19) |  | 0 |  | (71) |  | 17 |
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 | 19 |  | 47 |  | 26 |  | 60 |
Transfers Into Level 3, Asset | 0 |  | 0 |  | 0 |  | 0 |
Transfers out of Level 3, Assets | 0 |  | 0 |  | (5) |  | 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 | 4 |  | 17 |  | 4 |  | 18 |
Sales, Assets | 0 |  | 0 |  | 0 |  | (1) |
Settlements, Assets | (4) |  | (11) |  | (6) |  | (24) |
Other, Assets | 0 |  | 0 |  | 0 |  | 0 |
Balance-End of Period, Assets | 19 |  | 53 |  | 19 |  | 53 |
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 |
Guaranteed Minimum Income Benefit [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Balance - Beginning of Period, Liabilities | 832 | [1] | 760 | [2] | 745 | [2] | 1,089 | [2]
Transfers into level 3, liability | 0 |  | 0 |  | 0 |  | 0 |
Transfers out of Level 3, Liabilities | 0 |  | 0 |  | 0 |  | 0 |
Change in Net Unrealized Gains (losses) included in OCI, Liabilities | 0 |  | 0 |  | 0 |  | 0 |
Net Realized Gains/(Losses), Liabilities | (22) | [1] | 59 | [2] | 86 | [2] | (252) | [2]
Purchases, Liabilities | 0 |  | 0 |  | 0 |  | 0 |
Sales, Liabilities | 0 |  | 0 |  | 0 |  | 0 |
Settlements, Liabilities | 0 |  | 0 |  | 0 |  | 0 |
Other, Liabilities | (26) | [1] | (1) | [2] | (47) | [2] | (19) | [2]
Balance - End of Period, Liabilities | 784 | [1] | 818 | [2] | 784 | [1] | 818 | [2]
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities | (22) | [1] | 59 | [2] | 86 | [2] | (252) | [2]
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Liabilities | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |
[1] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
[2] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.

X
- 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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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + 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 (c)(3) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + 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 (c)(3) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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