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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.