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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments not Recorded at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Asset-backed investments included in HTM securities | [1] | $ 9,054 | $ 9,184
Fair Value |  | 8,132 | 8,350
Other loans held for sale, carrying value |  | 50 | 103
Other loans held for sale, fair value |  | 50 | 103
Loans pledged as collateral for FHLB borrowed funds | [2] | 141,102 | 143,861
Loans and leases, fair value |  | 137,760 | 140,504
Other assets, carrying value |  | 791 | 869
Other assets, fair value |  | 791 | 869
Deposits, carrying value |  | 176,428 | 177,342
Deposits, fair value |  | 176,162 | 177,096
Short-term borrowed funds, carrying value |  | 9 | 505
Short-term borrowed funds, fair value |  | 9 | 505
Long-term borrowed funds, carrying value | [2] | 13,804 | 13,467
Long-term borrowed funds, fair value |  | 13,421 | 13,012
Level 1 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Asset-backed investments included in HTM securities |  | 0 | 0
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
Short-term borrowed funds, carrying value |  | 0 | 0
Short-term borrowed funds, 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] |  |  |
Asset-backed investments included in HTM securities |  | 8,587 | 8,696
Fair Value |  | 7,682 | 7,887
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 |  | 881 | 789
Loans and leases, fair value |  | 881 | 789
Other assets, carrying value |  | 768 | 851
Other assets, fair value |  | 768 | 851
Deposits, carrying value |  | 176,428 | 177,342
Deposits, fair value |  | 176,162 | 177,096
Short-term borrowed funds, carrying value |  | 9 | 505
Short-term borrowed funds, fair value |  | 9 | 505
Long-term borrowed funds, carrying value |  | 13,804 | 13,467
Long-term borrowed funds, fair value |  | 13,421 | 13,012
Level 3 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Asset-backed investments included in HTM securities |  | 467 | 488
Fair Value |  | 450 | 463
Other loans held for sale, carrying value |  | 50 | 103
Other loans held for sale, fair value |  | 50 | 103
Loans pledged as collateral for FHLB borrowed funds |  | 140,221 | 143,072
Loans and leases, fair value |  | 136,879 | 139,715
Other assets, carrying value |  | 23 | 18
Other assets, fair value |  | 23 | 18
Deposits, carrying value |  | 0 | 0
Deposits, fair value |  | 0 | 0
Short-term borrowed funds, carrying value |  | 0 | 0
Short-term borrowed funds, 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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