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Commitments, Contingent Liabilities and Guarantees - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Mar. 31, 2026	Feb. 01, 2026	Dec. 31, 2025	Sep. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2008
Loss Contingencies
Margin account balance held by the brokerage clearing agent	$ 17		$ 17				$ 13
Derivative Liabilities	2,666		2,666				2,034
Delegated Underwriting and Servicing | Commercial mortgage loans
Loss Contingencies
Loss share guarantee liability	3		3
Servicing of residential mortgage loans for other investors	1,700		1,700
Total Return Swap
Loss Contingencies
Derivative Liabilities	70		70				124
Comerica Incorporated | Total Return Swap
Loss Contingencies
Business Combination, Recognized Liability Assumed, Financial Liability						$ 6
Visa
Loss Contingencies
Visa IPO, shares of Visa's Class B common stock received (in shares)											10.1
Visa Class B shares carryover basis											$ 0
Escrow deposit	250		250		$ 125		500	$ 500	$ 375	$ 8,115	$ 3,000
Residential mortgage loans
Loss Contingencies
Fair value of liability	5		5
Repurchase demand request	9	$ 8	18	$ 17
Outstanding repurchase demand inventory	6		6				5
Servicing of residential mortgage loans for other investors	85,900		85,900				87,800
Swap
Loss Contingencies
Derivative Liabilities	70	$ 145	70	$ 145
Secured Debt
Loss Contingencies
Fully and unconditionally guaranteed certain long-term borrowing obligations issued by wholly-owned issuing trust entities	62		62				62
Standby Letters of Credit
Loss Contingencies
Reserve for unfunded commitments	$ 24		$ 24				$ 9
Standby letters of credit as a percentage of total letters of credit	99.00%		99.00%				99.00%
Standby Letters of Credit | Secured Debt
Loss Contingencies
Standby letters of credit as a percentage of total letters of credit	77.00%		77.00%				77.00%
Derivatives, Fair Value, by Balance Sheet Location [Axis]: us-gaap:OtherLiabilities
Loss Contingencies
Reserve for unfunded commitments	$ 230		$ 230				$ 157
Derivatives, Fair Value, by Balance Sheet Location [Axis]: us-gaap:OtherLiabilities | Residential mortgage loans
Loss Contingencies
Outstanding balances on residential mortgage loans sold with representation and warranty provisions	$ 4		$ 4				$ 4

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