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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments not Recorded at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt securities held to maturity, carrying value | [1] | $ 8,469 | $ 8,599
Debt securities held to maturity, fair value |  | 7,515 | 7,540
Other loans held for sale, carrying value |  | 1,683 | 33
Other loans held for sale, fair value |  | 1,683 | 33
Loans pledged as collateral for FHLB borrowed funds | [2] | 135,621 | 137,142
Loans and leases, fair value |  | 134,844 | 136,293
Other assets, carrying value |  | 711 | 710
Other assets, fair value |  | 711 | 710
Deposits, carrying value |  | 177,576 | 174,776
Deposits, fair value |  | 177,508 | 174,651
Long-term borrowed funds, carrying value | [2] | 12,267 | 12,401
Long-term borrowed funds, fair value |  | 12,222 | 12,247
Level 1 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt securities held to maturity, carrying value |  | 0 | 0
Debt securities held to maturity, fair value |  | 0 | 0
Other loans held for sale, carrying value |  | 0 | 0
Other loans held for sale, fair value |  | 0 | 0
Loans pledged as collateral for FHLB borrowed funds |  | 0 | 0
Loans and leases, fair value |  | 0 | 0
Other assets, carrying value |  | 0 | 0
Other assets, fair value |  | 0 | 0
Deposits, carrying value |  | 0 | 0
Deposits, fair value |  | 0 | 0
Long-term borrowed funds, carrying value |  | 0 | 0
Long-term borrowed funds, fair value |  | 0 | 0
Level 2 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt securities held to maturity, carrying value |  | 8,077 | 8,187
Debt securities held to maturity, fair value |  | 7,129 | 7,136
Other loans held for sale, carrying value |  | 0 | 0
Other loans held for sale, fair value |  | 0 | 0
Loans pledged as collateral for FHLB borrowed funds |  | 910 | 979
Loans and leases, fair value |  | 910 | 979
Other assets, carrying value |  | 689 | 689
Other assets, fair value |  | 689 | 689
Deposits, carrying value |  | 177,576 | 174,776
Deposits, fair value |  | 177,508 | 174,651
Long-term borrowed funds, carrying value |  | 12,267 | 12,401
Long-term borrowed funds, fair value |  | 12,222 | 12,247
Level 3 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt securities held to maturity, carrying value |  | 392 | 412
Debt securities held to maturity, fair value |  | 386 | 404
Other loans held for sale, carrying value |  | 1,683 | 33
Other loans held for sale, fair value |  | 1,683 | 33
Loans pledged as collateral for FHLB borrowed funds |  | 134,711 | 136,163
Loans and leases, fair value |  | 133,934 | 135,314
Other assets, carrying value |  | 22 | 21
Other assets, fair value |  | 22 | 21
Deposits, carrying value |  | 0 | 0
Deposits, fair value |  | 0 | 0
Long-term borrowed funds, carrying value |  | 0 | 0
Long-term borrowed funds, fair value |  | $ 0 | $ 0
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.
[2] | Includes amounts in consolidated VIEs. See Note 6 for additional information.

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- Definition Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). + 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 + Details
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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of 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 + Details
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