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Bank Loans and Related Allowance for Credit Losses - Composition of Bank Loans and Delinquency Analysis by Loan Segment (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Jun. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Financing Receivable, Past Due [Line Items]            
Total loans $ 53,592,000,000 $ 45,236,000,000        
Allowance for credit losses 22,000,000 21,000,000 $ 22,000,000 $ 20,000,000 $ 20,000,000 $ 38,000,000
Total bank loans – net 53,570,000,000 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 53,520,000,000 45,150,000,000        
Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 72,000,000 86,000,000        
30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 23,000,000 45,000,000        
60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 9,000,000 6,000,000        
More than or equal to 90 days past
due and other
nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 40,000,000 35,000,000        
Residential real estate            
Financing Receivable, Past Due [Line Items]            
Total loans 29,782,000,000 27,813,000,000        
Allowance for credit losses 16,000,000 15,000,000 16,000,000 15,000,000 15,000,000 34,000,000
Total bank loans – net 29,766,000,000 27,798,000,000        
Unamortized premiums and discounts and direct origination costs $ 125,000,000 $ 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 $ 29,721,000,000 $ 27,742,000,000        
Residential real estate | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 61,000,000 71,000,000        
Residential real estate | 30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 19,000,000 37,000,000        
Residential real estate | 60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 6,000,000 6,000,000        
Residential real estate | More than or equal to 90 days past
due and other
nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 36,000,000 28,000,000        
Residential real estate | First Mortgages            
Financing Receivable, Past Due [Line Items]            
Total loans 29,361,000,000 27,389,000,000        
Allowance for credit losses 15,000,000 14,000,000 15,000,000 14,000,000 14,000,000 32,000,000
Total bank loans – net 29,346,000,000 27,375,000,000        
Residential real estate | First Mortgages | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 29,304,000,000 27,321,000,000        
Residential real estate | First Mortgages | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 57,000,000 68,000,000        
Residential real estate | First Mortgages | 30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 18,000,000 37,000,000        
Residential real estate | First Mortgages | 60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 6,000,000 6,000,000        
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 33,000,000 25,000,000        
Residential real estate | HELOCs            
Financing Receivable, Past Due [Line Items]            
Total loans 421,000,000 424,000,000        
Allowance for credit losses 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 2,000,000
Total bank loans – net 420,000,000 423,000,000        
Residential real estate | HELOCs | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 417,000,000 421,000,000        
Residential real estate | HELOCs | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 4,000,000 3,000,000        
Residential real estate | HELOCs | 30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 1,000,000 0        
Residential real estate | HELOCs | 60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 0 0        
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 3,000,000 3,000,000        
Pledged asset lines            
Financing Receivable, Past Due [Line Items]            
Total loans 23,390,000,000 17,024,000,000        
Allowance for credit losses 0 0 0 0 0 0
Total bank loans – net 23,390,000,000 17,024,000,000        
Pledged asset lines | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 23,380,000,000 17,010,000,000        
Pledged asset lines | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 10,000,000 14,000,000        
Pledged asset lines | 30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 4,000,000 8,000,000        
Pledged asset lines | 60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 3,000,000 0        
Pledged asset lines | More than or equal to 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 420,000,000 399,000,000        
Allowance for credit losses 6,000,000 6,000,000 $ 6,000,000 $ 5,000,000 $ 5,000,000 $ 4,000,000
Total bank loans – net 414,000,000 393,000,000        
Other | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 419,000,000 398,000,000        
Other | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 1,000,000 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 | More than or equal to 90 days past
due and other
nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans $ 1,000,000 $ 1,000,000