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LOANS - Non-Accrual Corporate Loans (Details) - Corporate loans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 934		$ 934		$ 660
Related specific allowance	227		227		302
Non-accrual loans for which there is no ACLL	1,137		1,137		717
Interest income recognized	3	$ 28	17	$ 58
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Recorded investment	486		486		199
Related specific allowance	123		123		86
Non-accrual loans for which there is no ACLL	417		417		343
Financial institutions
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0		0
Related specific allowance	0		0		0
Non-accrual loans for which there is no ACLL	77		77		73
Mortgage and real estate
Financing Receivable, Impaired [Line Items]
Recorded investment	417		417		276
Related specific allowance	29		29		42
Non-accrual loans for which there is no ACLL	507		507		291
Lease financing
Financing Receivable, Impaired [Line Items]
Non-accrual loans for which there is no ACLL	0		0		0
Other
Financing Receivable, Impaired [Line Items]
Recorded investment	31		31		185
Related specific allowance	75		75		174
Non-accrual loans for which there is no ACLL	$ 136		$ 136		$ 10

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Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Nonaccrual

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- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. 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 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with no allowance for credit loss. 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 16
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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