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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Summary of Changes in Allowance for Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	$ 1,252
Provision charged to income	1,616	$ 393	$ 326
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	2,443	1,252
Allowance for loan and lease losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	1,252	1,242	1,236
Charge-offs	(843)	(615)	(494)
Recoveries	150	185	177
Net charge-offs	(693)	(430)	(317)
Provision charged to income	1,431	440	323
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	2,443	1,252	1,242
Reserve for unfunded lending commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	44	91	88
Provision for unfunded lending commitments	185	(47)	3
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	227	44	91
Allowance, Credit Loss
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	1,296	1,333
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	2,670	1,296	1,333
Commercial | Allowance for loan and lease losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	674	690	685
Charge-offs	(437)	(140)	(52)
Recoveries	12	24	19
Net charge-offs	(425)	(116)	(33)
Provision charged to income	1,160	100	38
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	1,233	674	690
Commercial | Reserve for unfunded lending commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	44	91	88
Provision for unfunded lending commitments	145	(47)	3
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	186	44	91
Commercial | Allowance, Credit Loss
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	718	781
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	1,419	718	781
Retail | Allowance for loan and lease losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	578	552	551
Charge-offs	(406)	(475)	(442)
Recoveries	138	161	158
Net charge-offs	(268)	(314)	(284)
Provision charged to income	271	340	285
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	1,210	578	552
Retail | Reserve for unfunded lending commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	0	0	0
Provision for unfunded lending commitments	40	0	0
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	41	0	0
Retail | Allowance, Credit Loss
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	578	552
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	1,251	578	$ 552
Cumulative Effect, Period of Adoption, Adjustment | Allowance for loan and lease losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	453
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance		453
Cumulative Effect, Period of Adoption, Adjustment | Reserve for unfunded lending commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	(2)
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance		(2)
Cumulative Effect, Period of Adoption, Adjustment | Commercial | Allowance for loan and lease losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	(176)
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance		(176)
Cumulative Effect, Period of Adoption, Adjustment | Commercial | Reserve for unfunded lending commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	(3)
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance		(3)
Cumulative Effect, Period of Adoption, Adjustment | Retail | Allowance for loan and lease losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	629
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance		629
Cumulative Effect, Period of Adoption, Adjustment | Retail | Reserve for unfunded lending commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	1
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance		1
Cumulative Effect, Period Of Adoption, Adjusted Balance | Allowance for loan and lease losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	1,705
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance		1,705
Cumulative Effect, Period Of Adoption, Adjusted Balance | Reserve for unfunded lending commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	42
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance		42
Cumulative Effect, Period Of Adoption, Adjusted Balance | Commercial | Allowance for loan and lease losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	498
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance		498
Cumulative Effect, Period Of Adoption, Adjusted Balance | Commercial | Reserve for unfunded lending commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	41
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance		41
Cumulative Effect, Period Of Adoption, Adjusted Balance | Retail | Allowance for loan and lease losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	1,207
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance		1,207
Cumulative Effect, Period Of Adoption, Adjusted Balance | Retail | Reserve for unfunded lending commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	$ 1
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance		$ 1

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Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

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

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