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Lending Activities - Loan Modifications (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Allowance for losses on Mortgage and other loans receivable    
Weighted average term increase from modification (less than) 1 year  
Other loans    
Allowance for losses on Mortgage and other loans receivable    
Financing receivable, modified loans to percent of two portfolio segments (as a percent) (less than) 4.00%  
Commercial mortgage loans    
Allowance for losses on Mortgage and other loans receivable    
Financing receivable, modified loans to percent of two portfolio segments (as a percent) (less than) 1.00%  
Commercial Mortgage Loans | Extended Maturity    
Allowance for losses on Mortgage and other loans receivable    
Amortized cost $ 17  
Commercial loans, other loans, and notes receivable | Extended Maturity    
Allowance for losses on Mortgage and other loans receivable    
Amortized cost   $ 168