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Bank Loans and Related Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 40	$ 35
Accrued interest	211	171
Residential real estate | First Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Bank loans	$ 25,100
Percent of loans with interest-only payments	24.00%
Percent of interest only adjustable rate	71.00%
Total bank loans	$ 29,361	27,389
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
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
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	$ 421	$ 424
Percent of loan balance outstanding, borrowers paid only minimum due	64.00%
Residential real estate | Home Equity Secured By Second Liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total bank loans	$ 328

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