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Lending Activities - Composition of mortgages and other loans receivable (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Composition of Mortgages and other loans receivable        
Total mortgage and other loans receivable $ 48,544 $ 47,565    
Allowance for credit losses (714) (698) $ (659) $ (600)
Mortgage and other loans receivable, net [1] 47,830 46,867    
Off-balance-sheet commitments 48 58    
Commercial Mortgages        
Composition of Mortgages and other loans receivable        
Total mortgage and other loans receivable 34,651 34,172    
Allowance for credit losses $ (634) $ (614) (586) $ (531)
Weighted average loan-to-value ratio (as a percent) 59.00% 59.00%    
Weighted average debt service coverage ratio 1.9 1.9    
Off-balance-sheet commitments $ 48   $ 54  
Loans on nonacrrual status 546 $ 419    
Accrued interest receivable $ 166 $ 162    
Commercial Mortgages | New York        
Composition of Mortgages and other loans receivable        
Weighted average loan-to-value ratio (as a percent) 61.00% 61.00%    
Weighted average debt service coverage ratio 1.9 1.9    
Commercial Mortgages | California        
Composition of Mortgages and other loans receivable        
Weighted average loan-to-value ratio (as a percent) 56.00% 55.00%    
Weighted average debt service coverage ratio 2.1 2.1    
Commercial Mortgages | Geographic Concentration Risk | Interest on mortgage and other loans | New York        
Composition of Mortgages and other loans receivable        
Percentage of mortgage loans in geographic area 19.00% 19.00%    
Commercial Mortgages | Geographic Concentration Risk | Interest on mortgage and other loans | California        
Composition of Mortgages and other loans receivable        
Percentage of mortgage loans in geographic area 10.00% 10.00%    
Residential mortgages        
Composition of Mortgages and other loans receivable        
Total mortgage and other loans receivable $ 9,000 $ 8,445    
Loans on nonacrrual status 32 27    
Accrued interest receivable 33 20    
Life insurance policy loans        
Composition of Mortgages and other loans receivable        
Total mortgage and other loans receivable 1,747 1,746    
Commercial loans, other loans and notes receivable        
Composition of Mortgages and other loans receivable        
Total mortgage and other loans receivable $ 3,146 $ 3,202    
[1] See Note 9 for details of balances associated with variable interest entities