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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Summary of Changes in Allowance for Credit Losses (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 06, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Allowance for loan and lease losses, beginning of period |  | $ 1,983 | $ 1,758 | $ 2,443
Allowance on PCD loans and leases at acquisition |  |  | 101 |
Charge-offs |  | (757) | (434) | (539)
Recoveries |  | 148 | 164 | 214
Net charge-offs |  | (609) | (270) | (325)
Provision expense (benefit) for loans and leases |  | 724 | 394 | (360)
Allowance for loan and lease losses, end of period |  | 2,098 | 1,983 | 1,758
Unfunded lending commitments [Roll Forward] |  |  |  |
Allowance for unfunded lending commitments, beginning of period |  | 257 | 176 | 227
Provision expense (benefit) for unfunded lending commitments |  | (37) | 80 | (51)
Allowance on PCD unfunded lending commitments at acquisition |  |  | 1 |
Allowance for unfunded lending commitments, end of period |  | 220 | 257 | 176
Total allowance for credit losses, end of period |  | 2,318 | 2,240 | 1,934
Investors Acquisition |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Allowance on PCD loans and leases at acquisition | $ 101 |  |  |
Online Deposit Business And 80 East Coast Branches Of HSBC Bank And Investors |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Provision expense (benefit) for loans and leases |  |  | 169 |
Commercial |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Allowance for loan and lease losses, beginning of period |  | 1,060 | 821 | 1,233
Allowance on PCD loans and leases at acquisition |  |  | 99 |
Charge-offs |  | (285) | (70) | (218)
Recoveries |  | 18 | 18 | 54
Net charge-offs |  | (267) | (52) | (164)
Provision expense (benefit) for loans and leases |  | 457 | 192 | (248)
Allowance for loan and lease losses, end of period |  | 1,250 | 1,060 | 821
Unfunded lending commitments [Roll Forward] |  |  |  |
Allowance for unfunded lending commitments, beginning of period |  | 207 | 153 | 186
Provision expense (benefit) for unfunded lending commitments |  | (32) | 53 | (33)
Allowance on PCD unfunded lending commitments at acquisition |  |  | 1 |
Allowance for unfunded lending commitments, end of period |  | 175 | 207 | 153
Total allowance for credit losses, end of period |  | 1,425 | 1,267 | 974
Commercial | Investors Acquisition |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Charge-offs |  |  | (34) |
Retail |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Allowance for loan and lease losses, beginning of period |  | 923 | 937 | 1,210
Allowance on PCD loans and leases at acquisition |  |  | 2 |
Charge-offs |  | (472) | (364) | (321)
Recoveries |  | 130 | 146 | 160
Net charge-offs |  | (342) | (218) | (161)
Provision expense (benefit) for loans and leases |  | 267 | 202 | (112)
Allowance for loan and lease losses, end of period |  | 848 | 923 | 937
Unfunded lending commitments [Roll Forward] |  |  |  |
Allowance for unfunded lending commitments, beginning of period |  | 50 | 23 | 41
Provision expense (benefit) for unfunded lending commitments |  | (5) | 27 | (18)
Allowance on PCD unfunded lending commitments at acquisition |  |  | 0 |
Allowance for unfunded lending commitments, end of period |  | 45 | 50 | 23
Total allowance for credit losses, end of period |  | $ 893 | $ 973 | $ 960

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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 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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