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Loans - Summary of Loans (Detail) - USD ($) $ in Millions	3 Months Ended
Loans - Summary of Loans (Detail) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Loans Receivable [Line Items]
Total loans, gross	$ 255,194		$ 239,882
Fair Value	4,379		4,905
Held For Sale	23,112		22,066
Allowance for loan losses	(2,345)	$ (4,508)	(2,148)	$ (4,666)
Total loans	252,849		237,734
Reduction in loan loss reserves	(258)	$ 125
Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	227,703		212,911
Allowance for loan losses	(2,345)		(2,148)
Total loans	225,358		210,763
Fair Value
Loans Receivable [Line Items]
Fair Value	4,379		4,905
Allowance for loan losses	0		0
Total loans	4,379		4,905
Held For Sale
Loans Receivable [Line Items]
Held For Sale	23,112		22,066
Allowance for loan losses	0		0
Total loans	23,112		22,066
Corporate
Loans Receivable [Line Items]
Total loans, gross	38,156		30,676
Fair Value	342		326
Corporate \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	36,685		29,432
Corporate \| Fair Value
Loans Receivable [Line Items]
Fair Value	342		326
Corporate \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	1,129		918
Commercial real estate
Loans Receivable [Line Items]
Total loans, gross	38,779		37,409
Fair Value	417		420
Commercial real estate \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	36,904		36,261
Commercial real estate \| Fair Value
Loans Receivable [Line Items]
Fair Value	417		420
Commercial real estate \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	1,458		728
Residential real estate
Loans Receivable [Line Items]
Total loans, gross	32,885		31,957
Fair Value	3,066		3,257
Residential real estate \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	29,819		28,700
Residential real estate \| Fair Value
Loans Receivable [Line Items]
Fair Value	3,066		3,257
Residential real estate \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	0		0
Securities-based
Loans Receivable [Line Items]
Total loans, gross	18,592		18,079
Securities-based \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	18,592		18,079
Securities-based \| Fair Value
Loans Receivable [Line Items]
Fair Value	0		0
Securities-based \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	0		0
Other collateralized
Loans Receivable [Line Items]
Total loans, gross	104,592		98,999
Fair Value	511		855
Other collateralized \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	102,653		97,519
Other collateralized \| Fair Value
Loans Receivable [Line Items]
Fair Value	511		855
Other collateralized \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	1,428		625
Credit cards
Loans Receivable [Line Items]
Total loans, gross	19,055		19,742
Credit cards \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	0		0
Credit cards \| Fair Value
Loans Receivable [Line Items]
Fair Value	0		0
Credit cards \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	19,055		19,742
Other
Loans Receivable [Line Items]
Total loans, gross	3,135		3,020
Fair Value	43		47
Other \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	3,050		2,920
Other \| Fair Value
Loans Receivable [Line Items]
Fair Value	43		47
Other \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	$ 42		$ 53