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Policyholder Account Balances - Summary of Liabilities for Policyholder Account (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances |  | $ 15,047 | $ 15,540 |
Death and other insurance benefits |  | 2,914 | 2,887 |
Indexed universal life embedded derivatives |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | [1] | 16 | 15 |
Fixed indexed annuity embedded derivatives |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | [1] | 160 | 165 |
Life Insurance |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances |  | 7,341 | 7,460 | $ 7,694
Fixed Annuity |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances |  | 4,113 | 4,479 | 5,477
Variable Annuity |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances |  | 492 | 529 | $ 610
Additional insurance liabilities |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Death and other insurance benefits | [2] | 2,914 | 2,887 |
Other |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Other |  | $ 11 | $ 5 |
[1] | See note 5 for additional information.
[2] | Represents additional liabilities related to death or other insurance benefits that are recorded within policyholder account balances and are considered long-duration insurance contracts. See note 10 for additional information.

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- Definition Amount, before effect of reinsurance and after current period update of cash flow assumption and discount rate change, of present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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