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Additional Insurance Liabilities - Summary of Balances of and Changes in Additional Insurance Liabilities (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Additional Liability, Long-Duration Insurance [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | $ 2,887 | $ 2,566 | $ 2,566
Beginning balance before shadow accounting adjustments |  |  |  | 2,939 | 2,634 | 2,634
Effect of changes in cash flow assumptions |  | $ 0 |  | 0 |  | 200
Effect of actual variances from expected experience |  | (1) |  | (1) |  | (3)
Adjusted beginning balance |  |  |  | 2,938 | 2,831 | 2,831
Issuances |  |  |  | 0 |  | 0
Interest accretion | [1] | 25 | $ 22 | 50 | $ 44 | 90
Assessments collected |  |  |  | 125 |  | 240
Benefit payments |  |  |  | (120) |  | (222)
Derecognition (lapses and withdrawals) |  |  |  | 0 |  | 0
Ending balance before shadow accounting adjustments |  | 2,993 |  | 2,993 |  | 2,939
Effect of shadow accounting adjustments |  | (79) |  | (79) |  | (52)
Ending balance |  | 2,914 |  | 2,914 |  | 2,887
Less: reinsurance recoverable |  | 0 |  | 0 |  | 0
Additional insurance liabilities, net of reinsurance recoverable |  | $ 2,914 |  | $ 2,914 |  | $ 2,887
Weighted-average liability duration (years) |  | 18 years 4 months 24 days |  | 18 years 4 months 24 days |  | 18 years 10 months 24 days
[1] | Amounts for interest accretion are included in benefits and other changes in policy reserves in the condensed consolidated statements of income.

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- Definition Amount of assessments collected from policyholder related to 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 No definition available. + Details
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- Definition Amount, before effect of reinsurance, current period update of cash flow assumption and cumulative shadow accounting adjustments, 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 No definition available. + Details
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- Definition Amount, before effect of reinsurance and shadow accounting adjustments, 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 No definition available. + Details
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- Definition Amount of cumulative increase (decrease) in present value of total expected payment to policyholder in excess of present value of total expected assessment from unrealized investment gains or losses, or shadow accounting adjustments. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References No definition available. + Details
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- Definition Amount of cash outflow to policyholder related to benefit payment for 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/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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