Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Credit Losses of Loans and Leases) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 4,544	$ 4,693	$ 4,486	$ 4,791	$ 4,791
Charge-offs	(324)	(375)	(636)	(705)
Recoveries	126	113	233	200
Net (charge-offs)	(198)	(262)	(403)	(505)
Provision for credit losses	171	204	431	351
Other	6	1	9	(1)
Ending balance	4,523	4,636	4,523	4,636	4,486
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	674	672	719	663	663
Provision for (recapture of) credit losses	84	45	38	54
Other	1	0	2	0
Ending balance	759	717	759	717	719
Allowance for credit loss	5,282	5,353	5,282	5,353	5,200
Allowances for investment securities and other financial assets	88	112	88	112
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,205	3,217	3,148	3,259	3,259
Charge-offs	(163)	(198)	(294)	(346)	(720)
Recoveries	61	52	108	75
Net (charge-offs)	(102)	(146)	(186)	(271)
Provision for credit losses	121	172	259	257
Other	6	0	9	(2)
Ending balance	3,230	3,243	3,230	3,243	3,148
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	528	528	580	545	545
Provision for (recapture of) credit losses	87	53	34	36
Other	1	0	2	0
Ending balance	616	581	616	581	580
Allowance for credit loss	3,846	3,824	3,846	3,824
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,339	1,476	1,338	1,532	1,532
Charge-offs	(161)	(177)	(342)	(359)
Recoveries	65	61	125	125
Net (charge-offs)	(96)	(116)	(217)	(234)
Provision for credit losses	50	32	172	94
Other	0	1	0	1
Ending balance	1,293	1,393	1,293	1,393	1,338
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	146	144	139	118	118
Provision for (recapture of) credit losses	(3)	(8)	4	18
Other	0	0	0	0
Ending balance	143	136	143	136	$ 139
Allowance for credit loss	$ 1,436	$ 1,529	$ 1,436	$ 1,529

Debt Securities, Available-For-Sale And Held-To-Maturity, And Other Financial Assets, Allowance for Credit Loss

No definition available.

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- Definition

Total allowance for credit losses related to loans, including the allowance for loan and lease losses and allowance for unfunded lending related commitments

+ References

No definition available.

+ Details

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- Definition

Financing Receivable, Excluding Interest, Allowance for Credit Loss, Other Increase (Decrease)

+ References

No definition available.

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- Definition

Off-Balance-Sheet, Credit Loss, Liability, Other Credit Loss Expense (Reversal)

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

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

+ References

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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- Definition

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

+ References

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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

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- Definition

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
-URI https://asc.fasb.org/1943274/2147482454/460-10-45-1

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- Definition

Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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