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Distribution Across Property Type and Geographic Region for Commercial Mortgage Loans (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 6,692	$ 6,829
% of total	100.00%	100.00%
Allowance for credit losses	$ (30)	$ (27)
Commercial mortgage loans, net	6,662	6,802
Commercial Mortgage Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 6,692	$ 6,829
% of total	100.00%	100.00%
Allowance for credit losses	$ (30)	$ (27)
Commercial mortgage loans, net	6,662	6,802
South Atlantic | Commercial Mortgage Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 1,808	$ 1,803
% of total	27.00%	26.00%
Pacific | Commercial Mortgage Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 1,228	$ 1,281
% of total	18.00%	19.00%
Mountain | Commercial Mortgage Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 1,002	$ 1,029
% of total	15.00%	15.00%
Middle Atlantic | Commercial Mortgage Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 889	$ 925
% of total	13.00%	14.00%
West South Central | Commercial Mortgage Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 545	$ 553
% of total	8.00%	8.00%
East North Central | Commercial Mortgage Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 442	$ 445
% of total	7.00%	6.00%
West North Central | Commercial Mortgage Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 396	$ 404
% of total	6.00%	6.00%
East South Central | Commercial Mortgage Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 202	$ 206
% of total	3.00%	3.00%
New England | Commercial Mortgage Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 180	$ 183
% of total	3.00%	3.00%
Retail
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 2,794	$ 2,858
% of total	42.00%	42.00%
Office
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 1,457	$ 1,481
% of total	22.00%	22.00%
Industrial
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 1,400	$ 1,440
% of total	21.00%	21.00%
Apartments
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 513	$ 522
% of total	8.00%	8.00%
Mixed Use
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 372	$ 371
% of total	5.00%	5.00%
Other
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commercial mortgage loans, amortized cost	$ 156	$ 157
% of total	2.00%	2.00%

X

- Definition

This item represents the recorded investment of certain commercial mortgage loans as a percentage of the total recorded investment of commercial mortgage loans.

+ References

No definition available.

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- Definition

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

+ References

No definition available.

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- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

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- Definition

Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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