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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Loss (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward] |  |
Allowance for loan and lease losses, beginning of period | $ 2,098 | $ 1,983
Charge-offs | (231) | (171)
Recoveries | 50 | 38
Net charge-offs | (181) | (133)
Provision expense (benefit) for loans and leases | 169 | 167
Allowance for loan and lease losses, end of period | 2,086 | 2,017
Unfunded lending commitments [Roll Forward] |  |
Allowance for unfunded lending commitments, beginning of period | 220 | 257
Provision expense (benefit) for unfunded lending commitments | 2 | 1
Allowance for unfunded lending commitments, end of period | 222 | 258
Total allowance for credit losses, end of period | 2,308 | 2,275
Commercial |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Allowance for loan and lease losses, beginning of period | 1,250 | 1,060
Charge-offs | (102) | (59)
Recoveries | 17 | 7
Net charge-offs | (85) | (52)
Provision expense (benefit) for loans and leases | 69 | 103
Allowance for loan and lease losses, end of period | 1,234 | 1,111
Unfunded lending commitments [Roll Forward] |  |
Allowance for unfunded lending commitments, beginning of period | 175 | 207
Provision expense (benefit) for unfunded lending commitments | 16 | 8
Allowance for unfunded lending commitments, end of period | 191 | 215
Total allowance for credit losses, end of period | 1,425 | 1,326
Retail |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Allowance for loan and lease losses, beginning of period | 848 | 923
Charge-offs | (129) | (112)
Recoveries | 33 | 31
Net charge-offs | (96) | (81)
Provision expense (benefit) for loans and leases | 100 | 64
Allowance for loan and lease losses, end of period | 852 | 906
Unfunded lending commitments [Roll Forward] |  |
Allowance for unfunded lending commitments, beginning of period | 45 | 50
Provision expense (benefit) for unfunded lending commitments | (14) | (7)
Allowance for unfunded lending commitments, end of period | 31 | 43
Total allowance for credit losses, end of period | $ 883 | $ 949

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- Definition Financing Receivable, Allowance For Credit Loss, Excluding Accrued Interest And Off-Balance-Sheet, Credit Loss, Liability + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition 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 + Details
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- Definition Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. 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 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. 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 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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- Definition 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 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482454/460-10-45-1 + Details
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