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Separate accounts (Separate account liabilities rollforward) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Separate Account, Liability [Line Items] |  |  |
Separate Account, Liability, Beginning Balance |  | $ 5,573 | $ 5,190
Separate Account, Liability, Premium and Deposit |  | 264 | 266
Separate Account, Liability, Policy Charge |  | (43) | (35)
Separate Account, Liability, Surrender and Withdrawal |  | (210) | (111)
Separate Account, Liability, Benefit Payment |  | (105) | (99)
Separate Account, Liability, Increase (Decrease) from Invested Performance |  | 375 | 110
Separate Account, Liability, Increase (Decrease) from Other Change |  | 10 | (21)
Separate Account, Liability, Ending Balance |  | 5,864 | 5,300
Separate Account, Liability, Cash Surrender Value, Amount | [1] | $ 5,655 | $ 5,030
[1] | Cash surrender value represents the amount of the contract holder's account balances distributable at the balance sheet date less certain surrender charges.

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- Definition Amount of separate account liability payable to policyholder upon surrender of contract before maturity. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480078/944-80-55-18 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480109/944-80-50-2 + Details
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- Definition Amount of increase (decrease) in separate account liability from performance of investment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480078/944-80-55-18 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480109/944-80-50-2 + Details
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