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LOANS AND LEASES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest income on direct financing and sales-type leases | $ 77 |
Retail | Residential mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans pledged as collateral for FHLB borrowed funds | 25,300 | $ 25,600
Retail | Education loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchases | 1,100 | 457
Retail | Other loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchases | 530 |
Retail | Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Sales | 628 |
Retail | Retail ,TDRs |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Sales | 22 |
Commercial | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Sales | 454 | 553
Retail and Commercial | Auto, commercial and commercial real estate loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans pledged as collateral to support the contingent ability to borrow at the FRB discount window | $ 17,400 | $ 16,800
Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Term of contract | 3 years |
Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Term of contract | 7 years |

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- Definition The carrying amount, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of FHLB debt obligations, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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