ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for loan losses disclosures
Allowance for credit losses on loans, leases and unfunded lending commitments	$ 19,125	$ 18,326	$ 27,611
Allowance for credit losses on loans	16,974	16,455	24,956	$ 16,541
Allowance for credit losses on unfunded commitments (ACLUC)	2,151	1,871	2,655	1,456
Consumer
Allowance for loan losses disclosures
Allowance for credit losses on loans	14,119	14,040	20,180	14,630
Corporate
Allowance for loan losses disclosures
Allowance for credit losses on loans	$ 2,855	$ 2,415	$ 4,776	$ 1,911

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant