v3.26.1
Bank Loans and Related Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest $ 255 $ 223
Total residential real estate | First Mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Bank loans $ 28,500  
Percent of loans with interest-only payments 22.00%  
Percent of interest only adjustable rate 62.00%  
Total bank loans $ 32,782 30,484
Total residential real estate | First Mortgages | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Fixed rate interest rate period 3 years  
Adjusting rate interest rate period 6 months  
Interest-only reset period 3 years  
Total residential real estate | First Mortgages | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Fixed rate interest rate period 10 years  
Adjusting rate interest rate period 12 months  
Total residential real estate | HELOCs    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan term 30 years  
Initial draw period 10 years  
Converting to amortizing loans period 20 years  
Total bank loans $ 423 $ 427
Percent of loan balance outstanding, borrowers paid only minimum due 61.00%  
Total residential real estate | Home Equity Secured By Second Liens    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total bank loans $ 324