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Future Policy Benefits - Summary of Revenue and Interest Expense in Respect of Future Policy Benefits (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
Disclosure In Tabular Form Of Revenue And Interest Expense In Respect Of Future Policy Benefits [Line Items]          
Gross premiums $ 778 $ 845 $ 1,577 $ 1,699 $ 3,401
Interest expense [1] 763 764 1,529 1,527 3,060
Long-term Care Insurance          
Disclosure In Tabular Form Of Revenue And Interest Expense In Respect Of Future Policy Benefits [Line Items]          
Gross premiums 613 671 1,243 1,346 2,713
Interest expense [1] 589 582 1,178 1,160 2,333
Life Insurance          
Disclosure In Tabular Form Of Revenue And Interest Expense In Respect Of Future Policy Benefits [Line Items]          
Gross premiums 165 174 334 353 688
Interest expense [1] 14 16 29 33 64
Fixed annuities          
Disclosure In Tabular Form Of Revenue And Interest Expense In Respect Of Future Policy Benefits [Line Items]          
Gross premiums 0 0 0 0 0
Interest expense [1] $ 160 $ 166 $ 322 $ 334 $ 663
[1] Amounts for interest accretion are included in benefits and other changes in policy reserves in the condensed consolidated statements of income.