v3.25.4
Bank Loans and Related Allowance for Credit Losses - Composition of Bank Loans and Delinquency Analysis by Loan Segment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Past Due [Line Items]        
Total loans $ 57,991,000,000 $ 45,236,000,000    
Allowance for credit losses 36,000,000 21,000,000 $ 38,000,000 $ 73,000,000
Total bank
loans — net 57,955,000,000 45,215,000,000    
Loans accruing interest contractually 90 days or more past due 0 0    
Current        
Financing Receivable, Past Due [Line Items]        
Total loans 57,899,000,000 45,150,000,000    
Total past due and other nonaccrual loans        
Financing Receivable, Past Due [Line Items]        
Total loans 92,000,000 86,000,000    
30-59 days past due        
Financing Receivable, Past Due [Line Items]        
Total loans 34,000,000 45,000,000    
60-89 days past due        
Financing Receivable, Past Due [Line Items]        
Total loans 15,000,000 6,000,000    
>90 days past due and other nonaccrual loans        
Financing Receivable, Past Due [Line Items]        
Total loans 43,000,000 35,000,000    
Residential real estate        
Financing Receivable, Past Due [Line Items]        
Total loans 30,911,000,000 27,813,000,000    
Allowance for credit losses 29,000,000 15,000,000 34,000,000 70,000,000
Total bank
loans — net 30,882,000,000 27,798,000,000    
Unamortized premiums and discounts and direct origination costs $ 131,000,000 $ 112,000,000    
Residential real estate | Loans Geographic Area | California | Geographic Concentration Risk        
Financing Receivable, Past Due [Line Items]        
Concentration (percent) 41.00% 42.00%    
Residential real estate | Current        
Financing Receivable, Past Due [Line Items]        
Total loans $ 30,852,000,000 $ 27,742,000,000    
Residential real estate | Total past due and other nonaccrual loans        
Financing Receivable, Past Due [Line Items]        
Total loans 59,000,000 71,000,000    
Residential real estate | 30-59 days past due        
Financing Receivable, Past Due [Line Items]        
Total loans 14,000,000 37,000,000    
Residential real estate | 60-89 days past due        
Financing Receivable, Past Due [Line Items]        
Total loans 5,000,000 6,000,000    
Residential real estate | >90 days past due and other nonaccrual loans        
Financing Receivable, Past Due [Line Items]        
Total loans 40,000,000 28,000,000    
Pledged asset lines        
Financing Receivable, Past Due [Line Items]        
Total loans 26,603,000,000 17,024,000,000    
Allowance for credit losses 0 0 0 0
Total bank
loans — net 26,603,000,000 17,024,000,000    
Pledged asset lines | Current        
Financing Receivable, Past Due [Line Items]        
Total loans 26,570,000,000 17,010,000,000    
Pledged asset lines | Total past due and other nonaccrual loans        
Financing Receivable, Past Due [Line Items]        
Total loans 33,000,000 14,000,000    
Pledged asset lines | 30-59 days past due        
Financing Receivable, Past Due [Line Items]        
Total loans 20,000,000 8,000,000    
Pledged asset lines | 60-89 days past due        
Financing Receivable, Past Due [Line Items]        
Total loans 10,000,000 0    
Pledged asset lines | >90 days past due and other nonaccrual loans        
Financing Receivable, Past Due [Line Items]        
Total loans 3,000,000 6,000,000    
Other        
Financing Receivable, Past Due [Line Items]        
Total loans 477,000,000 399,000,000    
Allowance for credit losses 7,000,000 6,000,000 4,000,000 3,000,000
Total bank
loans — net 470,000,000 393,000,000    
Other | Current        
Financing Receivable, Past Due [Line Items]        
Total loans 477,000,000 398,000,000    
Other | Total past due and other nonaccrual loans        
Financing Receivable, Past Due [Line Items]        
Total loans 0 1,000,000    
Other | 30-59 days past due        
Financing Receivable, Past Due [Line Items]        
Total loans 0 0    
Other | 60-89 days past due        
Financing Receivable, Past Due [Line Items]        
Total loans 0 0    
Other | >90 days past due and other nonaccrual loans        
Financing Receivable, Past Due [Line Items]        
Total loans 0 1,000,000    
First Mortgages | Residential real estate        
Financing Receivable, Past Due [Line Items]        
Total loans 30,484,000,000 27,389,000,000    
Allowance for credit losses 28,000,000 14,000,000 32,000,000 66,000,000
Total bank
loans — net 30,456,000,000 27,375,000,000    
First Mortgages | Residential real estate | Current        
Financing Receivable, Past Due [Line Items]        
Total loans 30,429,000,000 27,321,000,000    
First Mortgages | Residential real estate | Total past due and other nonaccrual loans        
Financing Receivable, Past Due [Line Items]        
Total loans 55,000,000 68,000,000    
First Mortgages | Residential real estate | 30-59 days past due        
Financing Receivable, Past Due [Line Items]        
Total loans 13,000,000 37,000,000    
First Mortgages | Residential real estate | 60-89 days past due        
Financing Receivable, Past Due [Line Items]        
Total loans 5,000,000 6,000,000    
First Mortgages | Residential real estate | >90 days past due and other nonaccrual loans        
Financing Receivable, Past Due [Line Items]        
Total loans 37,000,000 25,000,000    
HELOCs | Residential real estate        
Financing Receivable, Past Due [Line Items]        
Total loans 427,000,000 424,000,000    
Allowance for credit losses 1,000,000 1,000,000 $ 2,000,000 $ 4,000,000
Total bank
loans — net 426,000,000 423,000,000    
HELOCs | Residential real estate | Current        
Financing Receivable, Past Due [Line Items]        
Total loans 423,000,000 421,000,000    
HELOCs | Residential real estate | Total past due and other nonaccrual loans        
Financing Receivable, Past Due [Line Items]        
Total loans 4,000,000 3,000,000    
HELOCs | Residential real estate | 30-59 days past due        
Financing Receivable, Past Due [Line Items]        
Total loans 1,000,000 0    
HELOCs | Residential real estate | 60-89 days past due        
Financing Receivable, Past Due [Line Items]        
Total loans 0 0    
HELOCs | Residential real estate | >90 days past due and other nonaccrual loans        
Financing Receivable, Past Due [Line Items]        
Total loans $ 3,000,000 $ 3,000,000