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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2022
Dec. 31, 2020
Dec. 31, 2019
Composition of Mortgages and other loans receivable            
Total mortgage and other loans receivable $ 46,528 $ 45,166 $ 39,884      
Allowance for credit losses (659) (600) (496) $ (488) $ (657) $ (357)
Mortgage and other loans receivable, net 45,869 44,566 39,388      
Off-balance-sheet commitments 54 60 57      
Commercial Mortgages            
Composition of Mortgages and other loans receivable            
Total mortgage and other loans receivable 33,692 32,993 30,528      
Allowance for credit losses $ (586) $ (531) $ (423) (413) (546) $ (266)
Weighted average loan-to-value ratio (as a percent) 58.00% 59.00% 57.00%      
Weighted average debt service coverage ratio 1.9 1.9 1.9      
Off-balance-sheet commitments $ 54 $ 60 $ 57 $ 93 $ 57  
Loans on nonacrrual status 650 623 118      
Accrued interest receivable $ 147 $ 130 $ 109      
Commercial Mortgages | New York            
Composition of Mortgages and other loans receivable            
Weighted average loan-to-value ratio (as a percent) 60.00% 59.00% 51.00%      
Weighted average debt service coverage ratio 2.0 2.0 2.0      
Commercial Mortgages | California            
Composition of Mortgages and other loans receivable            
Weighted average loan-to-value ratio (as a percent) 54.00% 53.00% 53.00%      
Weighted average debt service coverage ratio 2.1 2.1 1.9      
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% 20.00% 22.00%      
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% 11.00% 10.00%      
Residential mortgages            
Composition of Mortgages and other loans receivable            
Total mortgage and other loans receivable $ 6,627 $ 5,856 $ 4,672      
Loans on nonacrrual status 2 3 7      
Accrued interest receivable 17 15 11      
Life insurance policy loans            
Composition of Mortgages and other loans receivable            
Total mortgage and other loans receivable 1,740 1,750 1,832      
Commercial loans, other loans and notes receivable            
Composition of Mortgages and other loans receivable            
Total mortgage and other loans receivable 4,469 4,567 2,852      
Loans held for sale $ 173 $ 170 $ 15