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Distribution Across Property Type and Geographic Region for Commercial Mortgage Loans (Detail) - USD ($)
$ in Millions
Sep. 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 $ 6,570 $ 6,829
% of total 100.00% 100.00%
Allowance for credit losses $ (38) $ (27)
Commercial mortgage loans, net 6,532 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 $ 6,570 $ 6,829
% of total 100.00% 100.00%
Allowance for credit losses $ (38) $ (27)
Commercial mortgage loans, net 6,532 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 $ 1,794 $ 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 $ 1,177 $ 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 $ 977 $ 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 $ 875 $ 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 $ 540 $ 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 $ 447 $ 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 $ 388 $ 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 $ 194 $ 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 $ 178 $ 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 $ 2,762 $ 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 $ 1,431 $ 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 $ 1,342 $ 1,440
% of total 20.00% 21.00%
Apartments    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Commercial mortgage loans, amortized cost $ 508 $ 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 6.00% 5.00%
Other    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Commercial mortgage loans, amortized cost $ 155 $ 157
% of total 2.00% 2.00%