Loans, Lending Commitments and Related Allowance for Credit Losses - Past Due Loans Held for Investment Modified in the Last 12 Months (Details) - USD ($)
$ in Millions

Loans, Lending Commitments and Related Allowance for Credit Losses - Past Due Loans Held for Investment Modified in the Last 12 Months (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	$ 277,857	$ 269,852
Total
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	1,136		$ 865
Current and less than 30 days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	1,134		802
30-89 days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	2		0
90+ days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	0		63
Corporate
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	8,911	7,277
Corporate \| Total
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	221		185
Corporate \| Current and less than 30 days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	221		185
Corporate \| 30-89 days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	0		0
Corporate \| 90+ days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	0		0
Secured lending facilities
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	70,033	69,149
Secured lending facilities \| Total
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	20		42
Secured lending facilities \| Current and less than 30 days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	20		42
Secured lending facilities \| 30-89 days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	0		0
Secured lending facilities \| 90+ days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	0		0
Commercial real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	8,300	8,039
Commercial real estate \| Total
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	470		486
Commercial real estate \| Current and less than 30 days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	470		423
Commercial real estate \| 30-89 days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	0		0
Commercial real estate \| 90+ days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	0		63
Residential real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	73,529	72,403
Residential real estate \| Total
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	9		3
Residential real estate \| Current and less than 30 days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	7		3
Residential real estate \| 30-89 days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	2		0
Residential real estate \| 90+ days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	0		0
Securities-based lending and Other
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	117,084	$ 112,984
Securities-based lending and Other \| Total
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	416		149
Securities-based lending and Other \| Current and less than 30 days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	416		149
Securities-based lending and Other \| 30-89 days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	0		0
Securities-based lending and Other \| 90+ days past due
Financing Receivable, Modified, Subsequent Default [Line Items]
Total	$ 0		$ 0