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Loans, Lending Commitments and Related Allowance for Credit Losses - Modified Loans Held for Investment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 174	$ 212	$ 532	$ 676
Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 585	$ 107	$ 1,073	$ 421
Interest Rate Reduction (%)	0.50%	0.00%	0.60%	0.20%
Other-than-insignificant Payment Delay
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 1	$ 0	$ 24	$ 0
Interest Rate Reduction (%)	0.00%	0.00%	0.00%	0.00%
Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost			$ 1	$ 0
Interest Rate Reduction (%)			0.00%	0.00%
Multiple Modifications - Term Extension and Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 5	$ 0	$ 82	$ 1
Interest Rate Reduction (%)	0.00%	0.00%	0.10%	0.00%
Corporate
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 591	$ 107	$ 1,180	$ 422
Interest Rate Reduction (%)	0.30%	0.00%	0.60%	0.20%
Corporate | Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 42	$ 30	$ 172	$ 136
Interest Rate Reduction (%)	0.50%	0.50%	2.20%	2.20%
Corporate | Term Extension | Single Modifications
Financing Receivable, Modified [Line Items]
Weighted average term increase from modification	47 months	11 months	39 months	23 months
Corporate | Other-than-insignificant Payment Delay | Single Modifications
Financing Receivable, Modified [Line Items]
Weighted average term increase from modification	0 months	0 months	0 months	0 months
Corporate | Principal Forgiveness | Single Modifications
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 0	$ 0	$ 0	$ 0
Corporate | Interest Rate Reduction | Single Modifications
Financing Receivable, Modified [Line Items]
Interest Rate Reduction (%)	0.00%	0.00%	0.00%	0.00%
Commercial real estate | Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 146	$ 56	$ 471	$ 136
Interest Rate Reduction (%)	1.90%	0.60%	6.00%	1.60%
Commercial real estate | Term Extension | Single Modifications
Financing Receivable, Modified [Line Items]
Weighted average term increase from modification	24 months	27 months	31 months	14 months
Commercial real estate | Term Extension | Multiple Modifications - Term Extension and Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted average term increase from modification			65 months
Commercial real estate | Other-than-insignificant Payment Delay | Single Modifications
Financing Receivable, Modified [Line Items]
Weighted average term increase from modification	0 months	0 months	0 months	0 months
Commercial real estate | Other-than-insignificant Payment Delay | Multiple Modifications - Term Extension and Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted average term increase from modification				0 months
Commercial real estate | Principal Forgiveness | Single Modifications
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 0	$ 0	$ 0	$ 0
Commercial real estate | Principal Forgiveness | Multiple Modifications - Term Extension and Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost			$ 0
Commercial real estate | Interest Rate Reduction | Single Modifications
Financing Receivable, Modified [Line Items]
Interest Rate Reduction (%)	0.00%	0.00%	0.00%	0.00%
Commercial real estate | Interest Rate Reduction | Multiple Modifications - Term Extension and Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Interest Rate Reduction (%)			1.00%
Commercial real estate | Multiple Modifications - Term Extension and Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost			$ 75	$ 0
Interest Rate Reduction (%)			1.00%	0.00%
Residential real estate | Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost			$ 1	$ 0
Interest Rate Reduction (%)			0.00%	0.00%
Residential real estate | Term Extension | Single Modifications
Financing Receivable, Modified [Line Items]
Weighted average term increase from modification	0 months		29 months
Residential real estate | Term Extension | Multiple Modifications - Term Extension and Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted average term increase from modification	120 months		120 months	120 months
Residential real estate | Other-than-insignificant Payment Delay
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 1	$ 0	$ 1	$ 0
Interest Rate Reduction (%)	0.00%	0.00%	0.00%	0.00%
Residential real estate | Other-than-insignificant Payment Delay | Single Modifications
Financing Receivable, Modified [Line Items]
Weighted average term increase from modification	19 months		19 months
Residential real estate | Other-than-insignificant Payment Delay | Multiple Modifications - Term Extension and Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted average term increase from modification	0 months			0 months
Residential real estate | Principal Forgiveness | Single Modifications
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 0		$ 0
Residential real estate | Principal Forgiveness | Multiple Modifications - Term Extension and Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 0		0	$ 0
Residential real estate | Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost			$ 1	$ 0
Interest Rate Reduction (%)			0.00%	0.00%
Residential real estate | Interest Rate Reduction | Single Modifications
Financing Receivable, Modified [Line Items]
Interest Rate Reduction (%)	0.00%		0.00%
Residential real estate | Interest Rate Reduction | Multiple Modifications - Term Extension and Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Interest Rate Reduction (%)	1.00%		1.00%	1.00%
Residential real estate | Multiple Modifications - Term Extension and Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 5	$ 0	$ 7	$ 1
Interest Rate Reduction (%)	0.00%	0.00%	0.00%	0.00%
Securities-based lending and Other | Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 397	$ 21	$ 429	$ 149
Interest Rate Reduction (%)	0.40%	0.00%	0.40%	0.20%
Securities-based lending and Other | Term Extension | Single Modifications
Financing Receivable, Modified [Line Items]
Weighted average term increase from modification	24 months	12 months	23 months	21 months
Securities-based lending and Other | Other-than-insignificant Payment Delay
Financing Receivable, Modified [Line Items]
Amortized Cost			$ 23	$ 0
Interest Rate Reduction (%)			0.00%	0.00%
Securities-based lending and Other | Other-than-insignificant Payment Delay | Single Modifications
Financing Receivable, Modified [Line Items]
Weighted average term increase from modification	0 months	0 months	12 months	0 months
Securities-based lending and Other | Principal Forgiveness | Single Modifications
Financing Receivable, Modified [Line Items]
Amortized Cost	$ 0	$ 0	$ 0	$ 0
Securities-based lending and Other | Interest Rate Reduction | Single Modifications
Financing Receivable, Modified [Line Items]
Interest Rate Reduction (%)	0.00%	0.00%	0.00%	0.00%

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Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-Section 50
-Paragraph 42
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-Topic 310
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