Loans and Allowance for Credit Losses - Activity in Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 7,925	$ 7,839
Provision for credit losses	537	553
Loans charged-off	690	595
Less recoveries of loans charged-off	(143)	(107)
Net loan charge-offs (recoveries)	547	488
Balance at end of period	7,915	7,904
Add
Provision for credit losses	537	553
Deduct
Loans charged-off	690	595
Less recoveries of loans charged-off	(143)	(107)
Net loan charge-offs (recoveries)	547	488
Commercial \| Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	2,175	2,119
Provision for credit losses	200	156
Loans charged-off	187	139
Less recoveries of loans charged-off	(24)	(23)
Net loan charge-offs (recoveries)	163	116
Balance at end of period	2,212	2,159
Add
Provision for credit losses	200	156
Deduct
Loans charged-off	187	139
Less recoveries of loans charged-off	(24)	(23)
Net loan charge-offs (recoveries)	163	116
Commercial \| Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	1,508	1,620
Provision for credit losses	(80)	30
Loans charged-off	25	34
Less recoveries of loans charged-off	(29)	(13)
Net loan charge-offs (recoveries)	(4)	21
Balance at end of period	1,432	1,629
Add
Provision for credit losses	(80)	30
Deduct
Loans charged-off	25	34
Less recoveries of loans charged-off	(29)	(13)
Net loan charge-offs (recoveries)	(4)	21
Consumer \| Residential mortgages
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	783	827
Provision for credit losses	6	16
Loans charged-off	4	4
Less recoveries of loans charged-off	(4)	(4)
Net loan charge-offs (recoveries)	0	0
Balance at end of period	789	843
Add
Provision for credit losses	6	16
Deduct
Loans charged-off	4	4
Less recoveries of loans charged-off	(4)	(4)
Net loan charge-offs (recoveries)	0	0
Consumer \| Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	2,640	2,403
Provision for credit losses	329	318
Loans charged-off	386	337
Less recoveries of loans charged-off	(61)	(41)
Net loan charge-offs (recoveries)	325	296
Balance at end of period	2,644	2,425
Add
Provision for credit losses	329	318
Deduct
Loans charged-off	386	337
Less recoveries of loans charged-off	(61)	(41)
Net loan charge-offs (recoveries)	325	296
Consumer \| Other retail
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	819	870
Provision for credit losses	82	33
Loans charged-off	88	81
Less recoveries of loans charged-off	(25)	(26)
Net loan charge-offs (recoveries)	63	55
Balance at end of period	838	848
Add
Provision for credit losses	82	33
Deduct
Loans charged-off	88	81
Less recoveries of loans charged-off	(25)	(26)
Net loan charge-offs (recoveries)	$ 63	$ 55

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

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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 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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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 of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
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-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

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Financing Receivable, Excluding Accrued Interest, Allowance For Credit Loss And Off-Balance Sheet, Credit Loss, Liability

+ References

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Financing Receivable, Excluding Accrued Interest, Allowance For Credit Loss, Additions

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Financing Receivable, Excluding Accrued Interest, Allowance For Credit Loss, Deductions

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