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LOANS AND LEASES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for sale, at fair value: | $ 1,219 | $ 497
Other loans held for sale | 101 | 221
Level 2 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for sale, at fair value: | 1,219 | 497
Other loans held for sale | 0 | 0
Level 2 | Residential loans held for sale |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for sale, at fair value: | 967 | 326
Level 2 | Commercial loans held for sale |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for sale, at fair value: | 252 | 171
TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Sales |  | 78
Gain (loss) on sales of loans |  | 17
Residential mortgages | TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Sales |  | 49
Retail | Residential mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans pledged as collateral for FHLB borrowed funds | 25,600 | 24,900
Loans pledged as collateral to support the contingent ability to borrow at the FRB discount window | 16,800 | 18,100
Retail | Education loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchases | 457 | 862
Retail | Automobile loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchases |  | 153
Retail | Residential mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Sales |  | 254
Retail | Home equity loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Sales |  | 29
Commercial Portfolio Segment | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Sales | $ 553 | $ 603

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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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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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