Financing Receivables - Credit Quality Information - Financial Advisor Loans (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Financing receivables - credit quality information
Allowance for credit losses	$ 54	$ 46	$ 52	$ 54
Loan write-offs	1	1
Commercial Loans
Financing receivables - credit quality information
Allowance for credit losses	43	36	41	$ 45
Loan write-offs	1	$ 0
Commercial Loans \| Loans to financial advisors
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	199		637
Year 2	625		310
Year 3	300		280
Year 4	267		216
Year 5	204		80
Prior	207		150
Total	1,802		1,673
Commercial Loans \| Loans to financial advisors \| Active
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	199		637
Year 2	623		309
Year 3	299		280
Year 4	267		215
Year 5	203		79
Prior	197		142
Total	1,788		1,662
Commercial Loans \| Loans to financial advisors \| Terminated
Financing receivables - credit quality information
Allowance for credit losses	8		7
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	0		0
Year 2	2		1
Year 3	1		0
Year 4	0		1
Year 5	1		1
Prior	10		8
Total	$ 14		$ 11

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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