DERIVATIVES - Derivative Notionals (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative assets, location	Trading account assets	Trading account assets
Derivative liabilities, location	Trading account liabilities	Trading account liabilities
Hedging instruments under ASC 815
Derivatives
Derivative notionals	$ 525,314	$ 373,434
Hedging instruments under ASC 815 \| Interest rate contracts
Derivatives
Derivative notionals	412,754	276,939
Hedging instruments under ASC 815 \| Interest rate swaps
Derivatives
Derivative notionals	412,754	276,939
Hedging instruments under ASC 815 \| Interest rate futures and forwards
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Interest rate contract options \| Written options
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Interest rate contract options \| Purchased
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Foreign exchange contracts
Derivatives
Derivative notionals	101,458	92,092
Hedging instruments under ASC 815 \| Foreign exchange swaps
Derivatives
Derivative notionals	42,205	36,421
Hedging instruments under ASC 815 \| Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	59,253	55,671
Hedging instruments under ASC 815 \| Foreign exchange contract options \| Written options
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Foreign exchange contract options \| Purchased
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Equity contracts
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Equity swaps
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Equity futures and forwards
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Equity contract options \| Written options
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Equity contract options \| Purchased
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Commodity and other contracts
Derivatives
Derivative notionals	11,102	4,403
Hedging instruments under ASC 815 \| Commodity and other swaps
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Commodity and other futures and forwards
Derivatives
Derivative notionals	11,102	4,403
Hedging instruments under ASC 815 \| Commodity and other contract options \| Written options
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Commodity and other contract options \| Purchased
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Credit derivatives
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Credit derivatives \| Written options
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 \| Credit derivatives \| Purchased
Derivatives
Derivative notionals	0	0
Other derivative instruments, Trading derivatives
Derivatives
Derivative notionals	45,657,450	39,824,952
Other derivative instruments, Trading derivatives \| Interest rate contracts
Derivatives
Derivative notionals	25,891,915	23,577,823
Other derivative instruments, Trading derivatives \| Interest rate swaps
Derivatives
Derivative notionals	16,768,436	15,245,212
Other derivative instruments, Trading derivatives \| Interest rate futures and forwards
Derivatives
Derivative notionals	3,219,583	3,006,869
Other derivative instruments, Trading derivatives \| Interest rate contract options \| Written options
Derivatives
Derivative notionals	3,089,023	2,799,577
Other derivative instruments, Trading derivatives \| Interest rate contract options \| Purchased
Derivatives
Derivative notionals	2,814,873	2,526,165
Other derivative instruments, Trading derivatives \| Foreign exchange contracts
Derivatives
Derivative notionals	16,152,379	13,486,437
Other derivative instruments, Trading derivatives \| Foreign exchange swaps
Derivatives
Derivative notionals	9,307,564	7,422,309
Other derivative instruments, Trading derivatives \| Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	5,108,296	4,028,135
Other derivative instruments, Trading derivatives \| Foreign exchange contract options \| Written options
Derivatives
Derivative notionals	885,093	1,022,109
Other derivative instruments, Trading derivatives \| Foreign exchange contract options \| Purchased
Derivatives
Derivative notionals	851,426	1,013,884
Other derivative instruments, Trading derivatives \| Equity contracts
Derivatives
Derivative notionals	2,091,408	1,415,549
Other derivative instruments, Trading derivatives \| Equity swaps
Derivatives
Derivative notionals	520,623	323,751
Other derivative instruments, Trading derivatives \| Equity futures and forwards
Derivatives
Derivative notionals	107,399	73,437
Other derivative instruments, Trading derivatives \| Equity contract options \| Written options
Derivatives
Derivative notionals	809,293	581,659
Other derivative instruments, Trading derivatives \| Equity contract options \| Purchased
Derivatives
Derivative notionals	654,093	436,702
Other derivative instruments, Trading derivatives \| Commodity and other contracts
Derivatives
Derivative notionals	446,191	374,568
Other derivative instruments, Trading derivatives \| Commodity and other swaps
Derivatives
Derivative notionals	78,205	80,582
Other derivative instruments, Trading derivatives \| Commodity and other futures and forwards
Derivatives
Derivative notionals	230,619	183,494
Other derivative instruments, Trading derivatives \| Commodity and other contract options \| Written options
Derivatives
Derivative notionals	70,154	54,673
Other derivative instruments, Trading derivatives \| Commodity and other contract options \| Purchased
Derivatives
Derivative notionals	67,213	55,819
Other derivative instruments, Trading derivatives \| Credit derivatives
Derivatives
Derivative notionals	1,075,557	970,575
Other derivative instruments, Trading derivatives \| Credit derivatives \| Written options
Derivatives
Derivative notionals	475,228	439,146
Other derivative instruments, Trading derivatives \| Credit derivatives \| Purchased
Derivatives
Derivative notionals	$ 600,329	$ 531,429

Indicates line item in statement of financial position that includes derivative asset.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-10

+ Details

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Indicates line item in statement of financial position that includes derivative liability.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
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Period Type:	instant

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

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Balance Type:	na
Period Type:	instant