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Bank Loans and Related Allowance for Credit Losses - Composition of Bank Loans and Delinquency Analysis by Loan Segment (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, Past Due [Line Items]            
Total loans $ 50,427,000,000 $ 45,236,000,000        
Allowance for credit losses 22,000,000 21,000,000 $ 21,000,000 $ 20,000,000 $ 32,000,000 $ 38,000,000
Total bank loans – net 50,405,000,000 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 50,319,000,000 45,150,000,000        
Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 108,000,000 86,000,000        
30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 63,000,000 45,000,000        
60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 8,000,000 6,000,000        
More than or equal to 90 days past
due and other
nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 37,000,000 35,000,000        
Residential real estate            
Financing Receivable, Past Due [Line Items]            
Total loans 28,965,000,000 27,813,000,000        
Allowance for credit losses 16,000,000 15,000,000 15,000,000 15,000,000 28,000,000 34,000,000
Total bank loans – net 28,949,000,000 27,798,000,000        
Unamortized premiums and discounts and direct origination costs $ 120,000,000 $ 112,000,000        
Residential real estate | Loans Geographic Area | California | Geographic Concentration Risk            
Financing Receivable, Past Due [Line Items]            
Concentration risk percentage 42.00% 42.00%        
Residential real estate | Current            
Financing Receivable, Past Due [Line Items]            
Total loans $ 28,890,000,000 $ 27,742,000,000        
Residential real estate | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 75,000,000 71,000,000        
Residential real estate | 30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 33,000,000 37,000,000        
Residential real estate | 60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 7,000,000 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 35,000,000 28,000,000        
Residential real estate | First Mortgages            
Financing Receivable, Past Due [Line Items]            
Total loans 28,542,000,000 27,389,000,000        
Allowance for credit losses 15,000,000 14,000,000 14,000,000 14,000,000 27,000,000 32,000,000
Total bank loans – net 28,527,000,000 27,375,000,000        
Residential real estate | First Mortgages | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 28,470,000,000 27,321,000,000        
Residential real estate | First Mortgages | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 72,000,000 68,000,000        
Residential real estate | First Mortgages | 30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 32,000,000 37,000,000        
Residential real estate | First Mortgages | 60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 7,000,000 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 423,000,000 424,000,000        
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 422,000,000 423,000,000        
Residential real estate | HELOCs | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 420,000,000 421,000,000        
Residential real estate | HELOCs | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 3,000,000 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 2,000,000 3,000,000        
Pledged asset lines            
Financing Receivable, Past Due [Line Items]            
Total loans 21,038,000,000 17,024,000,000        
Allowance for credit losses 0 0 0 0 0 0
Total bank loans – net 21,038,000,000 17,024,000,000        
Pledged asset lines | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 21,006,000,000 17,010,000,000        
Pledged asset lines | Total past due and other nonaccrual loans            
Financing Receivable, Past Due [Line Items]            
Total loans 32,000,000 14,000,000        
Pledged asset lines | 30-59 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 30,000,000 8,000,000        
Pledged asset lines | 60-89 days past due            
Financing Receivable, Past Due [Line Items]            
Total loans 1,000,000 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 1,000,000 6,000,000        
Other            
Financing Receivable, Past Due [Line Items]            
Total loans 424,000,000 399,000,000        
Allowance for credit losses 6,000,000 6,000,000 $ 6,000,000 $ 5,000,000 $ 4,000,000 $ 4,000,000
Total bank loans – net 418,000,000 393,000,000        
Other | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 423,000,000 398,000,000        
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