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ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Allowance for loan losses disclosures
Total ACL	$ 23,778		$ 22,177	$ 22,091
Increase in total ACL	1,601
Allowance for credit losses	19,206	$ 19,123	18,574	18,356	$ 18,216	$ 18,145
Allowance for credit losses on unfunded commitments (ACLUC)	1,820	1,721	1,601	1,725	1,619	1,728
Increase in credit loss	219
Consumer loans
Allowance for loan losses disclosures
Allowance for credit losses	16,205	16,100	16,018	15,765	15,732	15,431
Increase in allowance	187
Corporate loans
Allowance for loan losses disclosures
Allowance for credit losses	3,001	$ 3,023	$ 2,556	$ 2,591	$ 2,484	$ 2,714
Increase in allowance	$ 445

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Financing Receivable, Off-Balance Sheet Liability, Other Assets, And HTM Debt Securities, Allowances For Credit Loss

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Financing Receivable, Off-Balance Sheet Liability, Other Assets, And HTM Debt Securities, Increase (Decrease) In Allowances For Credit Loss

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Off-Balance-Sheet, Increase (Decrease) In Credit Loss, Liability

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 326
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

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

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-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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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
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-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-2

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