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v3.25.2

Separate accounts (Separate account liabilities rollforward) (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Separate Account, Liability [Line Items] |  |  |
Separate Account, Liability, Beginning Balance |  | $ 6,231 | $ 5,573
Separate Account, Liability, Premium and Deposit |  | 802 | 576
Separate Account, Liability, Policy Charge |  | (79) | (80)
Separate Account, Liability, Surrender and Withdrawal |  | (494) | (426)
Separate Account, Liability, Benefit Payment |  | (225) | (208)
Separate Account, Liability, Increase (Decrease) from Invested Performance |  | (265) | 502
Separate Account, Liability, Increase (Decrease) from Other Change |  | 511 | (103)
Separate Account, Liability, Ending Balance |  | 6,481 | 5,834
Separate Account, Liability, Cash Surrender Value, Amount | [1] | $ 6,101 | $ 5,625
[1] | Cash surrender value represents the amount of the policyholder'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/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 Reference 2: 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 + 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/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 3: 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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