Loans and Related Allowance for Credit Losses, Allowance for Credit Losses for Loans (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Dec. 31, 2025
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	$ 14,337	$ 14,636	$ 14,552	$ 14,636
Provision for credit losses	1,139	925
Loan charge-offs, total	(1,462)	(1,277)
Loan recoveries, total	362	268
Net loan charge-offs	(1,100)	(1,009)
Other	(2)	0
Allowance for credit losses, end of period	14,374	14,552	14,374	14,337
Allowance for loan losses	13,864	14,029	13,864	13,797
Allowance for unfunded credit commitments	$ 510	$ 523	$ 510
Net loan charge-offs (annualized) as a percentage of average total loans	0.45%	0.45%
Allowance for loan losses as a percentage of total loans	1.36%	1.54%	1.36%
Allowance for credit losses for loans as a percentage of total loans	1.41%	1.59%	1.41%
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Total net loan charge-offs increase (decrease)			$ (91)
Allowance for credit loss for loans, period increase (decrease)	$ (37)
Total Commercial [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	7,457	$ 7,946	7,930	7,946
Provision for credit losses	433	195
Loan charge-offs, total	(465)	(255)
Loan recoveries, total	105	44
Net loan charge-offs	(360)	(211)
Other	(1)	0
Allowance for credit losses, end of period	7,529	7,930	7,529	7,457
Total Commercial [Member] \| Commercial and industrial loans [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loan charge-offs, loans	(372)	(148)		(704)
Loan recoveries, loans	41	40
Total Commercial [Member] \| Commercial real estate [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loan charge-offs, loans	(80)	(96)		(497)
Loan recoveries, loans	61	1
Total Commercial [Member] \| Lease financing [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loan charge-offs, lease financing	(13)	(11)		(50)
Loan recoveries, lease financing	3	3
Total Consumer [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	6,880	6,690	6,622	6,690
Provision for credit losses	706	730
Loan charge-offs, loans	(997)	(1,022)
Loan recoveries, loans	257	224
Net loan charge-offs	(740)	(798)
Other	(1)	0
Allowance for credit losses, end of period	6,845	6,622	$ 6,845	6,880
Total Consumer [Member] \| Residential mortgage [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loan charge-offs, loans	(12)	(11)		(69)
Loan recoveries, loans	26	26
Total Consumer [Member] \| Credit card [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loan charge-offs, loans	(765)	(768)		(2,963)
Loan recoveries, loans	160	118
Total Consumer [Member] \| Auto [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loan charge-offs, loans	(114)	(127)		(453)
Loan recoveries, loans	51	63
Total Consumer [Member] \| Other consumer [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loan charge-offs, loans	(106)	(116)		$ (459)
Loan recoveries, loans	$ 20	$ 17

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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