v3.26.1
Bank Loans and Related Allowance for Credit Losses - Composition of Bank Loans and Delinquency Analysis by Loan Segment (Details) - USD ($)
Jun. 30, 2026
Dec. 31, 2025
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Financing Receivable, Past Due [Line Items]            
Total loans $ 67,033,000,000 $ 57,991,000,000        
Allowance for credit losses 37,000,000 36,000,000 $ 36,000,000 $ 22,000,000 $ 21,000,000 $ 21,000,000
Total bank loans — net 66,996,000,000 57,955,000,000        
Loans accruing interest contractually 90 days or more past due 0 0        
Current            
Financing Receivable, Past Due [Line Items]            
Total loans 66,882,000,000 57,899,000,000        
Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 151,000,000 92,000,000        
30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 123,000,000 34,000,000        
60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 2,000,000 15,000,000        
More than or equal to 90 days past
due and other
nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 26,000,000 43,000,000        
Total residential real estate            
Financing Receivable, Past Due [Line Items]            
Total loans 33,205,000,000 30,911,000,000        
Allowance for credit losses 31,000,000 29,000,000 30,000,000 16,000,000 15,000,000 15,000,000
Total bank loans — net 33,174,000,000 30,882,000,000        
Unamortized premiums and discounts and direct origination costs $ 144,000,000 $ 131,000,000        
Total residential real estate | Loans Geographic Area | California | Geographic Concentration Risk            
Financing Receivable, Past Due [Line Items]            
Concentration (percent) 40.00% 41.00%        
Total residential real estate | Current            
Financing Receivable, Past Due [Line Items]            
Total loans $ 33,075,000,000 $ 30,852,000,000        
Total residential real estate | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 130,000,000 59,000,000        
Total residential real estate | 30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 112,000,000 14,000,000        
Total residential real estate | 60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 2,000,000 5,000,000        
Total residential real estate | More than or equal to 90 days past
due and other
nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 16,000,000 40,000,000        
Total residential real estate | First Mortgages            
Financing Receivable, Past Due [Line Items]            
Total loans 32,782,000,000 30,484,000,000        
Allowance for credit losses 30,000,000 28,000,000 29,000,000 15,000,000 14,000,000 14,000,000
Total bank loans — net 32,752,000,000 30,456,000,000        
Total residential real estate | First Mortgages | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 32,655,000,000 30,429,000,000        
Total residential real estate | First Mortgages | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 127,000,000 55,000,000        
Total residential real estate | First Mortgages | 30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 111,000,000 13,000,000        
Total residential real estate | First Mortgages | 60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 2,000,000 5,000,000        
Total residential real estate | First Mortgages | More than or equal to 90 days past
due and other
nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 14,000,000 37,000,000        
Total residential real estate | HELOCs            
Financing Receivable, Past Due [Line Items]            
Total loans 423,000,000 427,000,000        
Allowance for credit losses 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000
Total bank loans — net 422,000,000 426,000,000        
Total residential real estate | HELOCs | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 420,000,000 423,000,000        
Total residential real estate | HELOCs | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 3,000,000 4,000,000        
Total residential real estate | HELOCs | 30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 1,000,000 1,000,000        
Total residential real estate | HELOCs | 60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 0 0        
Total residential real estate | HELOCs | More than or equal to 90 days past
due and other
nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 2,000,000 3,000,000        
Pledged asset lines            
Financing Receivable, Past Due [Line Items]            
Total loans 33,416,000,000 26,603,000,000        
Allowance for credit losses 0 0 0 0 0 0
Total bank loans — net 33,416,000,000 26,603,000,000        
Pledged asset lines | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 33,396,000,000 26,570,000,000        
Pledged asset lines | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 20,000,000 33,000,000        
Pledged asset lines | 30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 10,000,000 20,000,000        
Pledged asset lines | 60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 0 10,000,000        
Pledged asset lines | More than or equal to 90 days past
due and other
nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 10,000,000 3,000,000        
Other            
Financing Receivable, Past Due [Line Items]            
Total loans 412,000,000 477,000,000        
Allowance for credit losses 6,000,000 7,000,000 $ 6,000,000 $ 6,000,000 $ 6,000,000 $ 6,000,000
Total bank loans — net 406,000,000 470,000,000        
Other | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 411,000,000 477,000,000        
Other | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 1,000,000 0        
Other | 30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 1,000,000 0        
Other | 60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 0 0        
Other | More than or equal to 90 days past
due and other
nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans $ 0 $ 0