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Loans - Summary of Loans (Detail) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended
Loans - Summary of Loans (Detail) - USD ($)	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2023
Loans Receivable [Line Items]
Total loans, gross	$ 226,887,000,000	$ 226,887,000,000		$ 200,866,000,000
Fair Value	5,498,000,000	5,498,000,000		5,460,000,000
Held For Sale	2,502,000,000	2,502,000,000		3,525,000,000
Allowance for loan losses	(4,508,000,000)	(4,508,000,000)	$ (4,752,000,000)	(4,666,000,000)	$ (4,537,000,000)	$ (4,808,000,000)	$ (5,050,000,000)
Total loans	222,379,000,000	222,379,000,000		196,200,000,000
Loans sold		425,000,000	$ 3,930,000,000
Seller Financing Loan Portfolio
Loans Receivable [Line Items]
Loans sold				0
GreenSky
Loans Receivable [Line Items]
Loans sold				3,690,000,000
GM
Loans Receivable [Line Items]
Loans sold	1,540,000,000
Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	218,887,000,000	218,887,000,000		191,881,000,000
Allowance for loan losses	(4,508,000,000)	(4,508,000,000)		(4,666,000,000)
Total loans	214,379,000,000	214,379,000,000		187,215,000,000
Fair Value
Loans Receivable [Line Items]
Fair Value	5,498,000,000	5,498,000,000		5,460,000,000
Allowance for loan losses	0	0		0
Total loans	5,498,000,000	5,498,000,000		5,460,000,000
Held For Sale
Loans Receivable [Line Items]
Held For Sale	2,502,000,000	2,502,000,000		3,525,000,000
Allowance for loan losses	0	0		0
Total loans	2,502,000,000	2,502,000,000		3,525,000,000
Corporate
Loans Receivable [Line Items]
Total loans, gross	31,804,000,000	31,804,000,000		29,972,000,000
Fair Value	430,000,000	430,000,000		467,000,000
Corporate \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	30,139,000,000	30,139,000,000		28,689,000,000
Corporate \| Fair Value
Loans Receivable [Line Items]
Fair Value	430,000,000	430,000,000		467,000,000
Corporate \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	1,235,000,000	1,235,000,000		816,000,000
Commercial real estate
Loans Receivable [Line Items]
Total loans, gross	33,952,000,000	33,952,000,000		29,789,000,000
Fair Value	423,000,000	423,000,000		424,000,000
Commercial real estate \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	32,805,000,000	32,805,000,000		28,899,000,000
Commercial real estate \| Fair Value
Loans Receivable [Line Items]
Fair Value	423,000,000	423,000,000		424,000,000
Commercial real estate \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	724,000,000	724,000,000		466,000,000
Residential real estate
Loans Receivable [Line Items]
Total loans, gross	30,147,000,000	30,147,000,000		25,969,000,000
Fair Value	3,445,000,000	3,445,000,000		3,726,000,000
Residential real estate \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	26,702,000,000	26,702,000,000		22,243,000,000
Residential real estate \| Fair Value
Loans Receivable [Line Items]
Fair Value	3,445,000,000	3,445,000,000		3,726,000,000
Residential real estate \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	0	0		0
Securities-based
Loans Receivable [Line Items]
Total loans, gross	18,469,000,000	18,469,000,000		16,477,000,000
Securities-based \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	18,469,000,000	18,469,000,000		16,477,000,000
Securities-based \| Fair Value
Loans Receivable [Line Items]
Fair Value	0	0		0
Securities-based \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	0	0		0
Other collateralized
Loans Receivable [Line Items]
Total loans, gross	89,764,000,000	89,764,000,000		75,107,000,000
Fair Value	1,149,000,000	1,149,000,000		783,000,000
Other collateralized \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	88,141,000,000	88,141,000,000		74,008,000,000
Other collateralized \| Fair Value
Loans Receivable [Line Items]
Fair Value	1,149,000,000	1,149,000,000		783,000,000
Other collateralized \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	474,000,000	474,000,000		316,000,000
Credit cards
Loans Receivable [Line Items]
Total loans, gross	20,017,000,000	20,017,000,000		21,403,000,000
Credit cards \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	20,017,000,000	20,017,000,000		19,615,000,000
Credit cards \| Fair Value
Loans Receivable [Line Items]
Fair Value	0	0		0
Credit cards \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	0	0		1,788,000,000
Other
Loans Receivable [Line Items]
Total loans, gross	2,734,000,000	2,734,000,000		2,149,000,000
Fair Value	51,000,000	51,000,000		60,000,000
Other \| Amortized Cost
Loans Receivable [Line Items]
Total loans, gross	2,614,000,000	2,614,000,000		1,950,000,000
Other \| Fair Value
Loans Receivable [Line Items]
Fair Value	51,000,000	51,000,000		60,000,000
Other \| Held For Sale
Loans Receivable [Line Items]
Held For Sale	69,000,000	69,000,000		139,000,000
Installment
Loans Receivable [Line Items]
Total loans, gross	$ 30,000,000	$ 30,000,000		$ 70,000,000