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Market risk benefits (MRB Roll-Forward) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Market Risk Benefit [Line Items] |  |  |
Market Risk Benefit, Liability, beginning of period |  | $ 771 |
Market Risk Benefit, Liability, end of period |  | 611 |
Market risk benefits gains (losses) |  | 21 | $ (115)
Long-Duration Insurance, Other | Variable Annuity |  |  |
Market Risk Benefit [Line Items] |  |  |
Market Risk Benefit, Liability, beginning of period |  | 771 | 800
Balance, beginning of period, before effect of changes in the instrument-specific credit risk |  | 749 | 776
Interest rate changes |  | (57) | 63
Effect of changes in equity markets |  | (77) | (75)
Effect of changes in volatilities |  | (20) | 57
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected |  | 30 | (2)
Effect of timing and all other |  | (31) | (16)
Balance, end of period, before effect of changes in the instrument-specific credit risk |  | 594 | 803
Effect of changes in the instrument-specific credit risk |  | 17 | 27
Market Risk Benefit, Liability, end of period |  | 611 | 830
Market Risk Benefit, Net Amount at Risk | [1] | 1,683 | 2,296
Market Risk Benefits Other Gains (Losses) |  | $ (134) | $ (89)
Weighted-average age of policyholders (years) |  | 74 years | 73 years
[1] | The net amount at risk is defined as the present value of future claim payments assuming policy account values and guaranteed values are fixed at the valuation date, and reinsurance coverage ends at the earlier of the maturity of the underlying variable annuity policy or the reinsurance treaty. No withdrawals, lapses, and mortality improvements are assumed in the projection. GLB-related risks contain conservative mortality and annuitization assumptions.

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- Definition Market Risk Benefits Other Gains (Losses) + References No definition available. + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in instrument-specific credit risk on contract or contract feature in long-duration contract issued by insurance entity protecting contract holder from other-than-nominal capital market risk and exposing insurance entity to other-than-nominal capital market risk. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29G -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7B Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13K -Subparagraph (k) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13K + Details
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- Definition Amount, before effect of reinsurance and cumulative increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29G -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7B + Details
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- Definition Amount of gain (loss) from (increase) decrease in fair value of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. Excludes change attributable to instrument-specific credit risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480112/944-40-45-3 + Details
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