Loans and Related Allowance for Credit Losses, Allowance for Credit Losses for Loans (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses for loans, beginning of period	$ 14,374	$ 14,552	$ 14,337	$ 14,636	$ 14,636
Provision for credit losses	911	1,007	2,050	1,932
Loan charge-offs, total	(1,200)	(1,335)	(2,662)	(2,612)
Loan recoveries, total	324	338	686	606
Net loan charge-offs	(876)	(997)	(1,976)	(2,006)
Other	(2)	6	(4)	6
Allowance for credit losses for loans, end of period	14,407	14,568	14,407	14,568	14,337
Allowance for loan losses	13,905	13,961	13,905	13,961	13,797
Allowance for unfunded credit commitments	$ 502	$ 607	$ 502	$ 607
Net loan charge-offs (annualized) as a percentage of average total loans	0.34%	0.44%	0.39%	0.44%
Allowance for loan losses as a percentage of total loans	1.35%	1.51%	1.35%	1.51%
Allowance for credit losses for loans as a percentage of total loans	1.40%	1.58%	1.40%	1.58%
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Allowance for credit loss for loans, period increase (decrease)			$ (70)
Total Commercial [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses for loans, beginning of period	$ 7,529	$ 7,930	7,457	$ 7,946	7,946
Provision for credit losses	25	147	458	342
Loan charge-offs, total	(210)	(330)	(675)	(585)
Loan recoveries, total	54	83	159	127
Net loan charge-offs	(156)	(247)	(516)	(458)
Other	(3)	5	(4)	5
Allowance for credit losses for loans, end of period	7,395	7,835	7,395	7,835	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	(163)	(213)	(535)	(361)	(704)
Loan recoveries, loans	32	34	73	74
Total Commercial [Member] \| Commercial real estate [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loan charge-offs, loans	(35)	(106)	(115)	(202)	(497)
Loan recoveries, loans	19	45	80	46
Total Commercial [Member] \| Lease financing [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loan charge-offs, lease financing	(12)	(11)	(25)	(22)	(50)
Loan recoveries, lease financing	3	4	6	7
Total Consumer [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses for loans, beginning of period	6,845	6,622	6,880	6,690	6,690
Provision for credit losses	886	860	1,592	1,590
Loan charge-offs, loans	(990)	(1,005)	(1,987)	(2,027)
Loan recoveries, loans	270	255	527	479
Net loan charge-offs	(720)	(750)	(1,460)	(1,548)
Other	1	1	0	1
Allowance for credit losses for loans, end of period	7,012	6,733	7,012	6,733	6,880
Total Consumer [Member] \| Residential mortgage [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loan charge-offs, loans	(11)	(32)	(23)	(43)	(69)
Loan recoveries, loans	25	35	51	61
Total Consumer [Member] \| Credit card [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loan charge-offs, loans	(770)	(751)	(1,535)	(1,519)	(2,963)
Loan recoveries, loans	170	129	330	247
Total Consumer [Member] \| Auto [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loan charge-offs, loans	(109)	(103)	(223)	(230)	(453)
Loan recoveries, loans	55	73	106	136
Total Consumer [Member] \| Other consumer [Member]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loan charge-offs, loans	(100)	(119)	(206)	(235)	$ (459)
Loan recoveries, loans	$ 20	$ 18	$ 40	$ 35

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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+ 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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