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SECURITIES - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Purchases of debt securities available for sale	$ 9,271,000,000	$ 8,422,000,000	$ 4,270,000,000
Accrued interest receivable on debt securities	55,000,000	58,000,000
Taxable interest income from investment securities	$ 519,000,000	642,000,000	672,000,000
Held-to-maturity, zero expected credit loss, percent of portfolio	72.00%
Held-to-maturity, expected credit loss, percent of portfolio	28.00%
Held-to-maturity, allowance for credit loss	$ 0
Retail | Education
Debt Securities, Available-for-sale [Line Items]
Sale of loans	1,100,000,000
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Securitizations of mortgage loans	144,000,000	$ 150,000,000	$ 142,000,000
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Purchases of debt securities available for sale	$ 893,000,000

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Amortized Cost Basis And Accrued And Capitalized Interest Of Loans Sold During The Period

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to state, federal and other income tax.

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