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BORROWED FUNDS - Short Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Short-term Debt [Line Items] |  |  |
Total short-term borrowed funds |  | $ 2,809 | $ 2,671
Federal funds purchased |  |  |
Short-term Debt [Line Items] |  |  |
Total short-term borrowed funds |  | 820 | 460
Securities sold under agreements to repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Total short-term borrowed funds |  | 336 | 355
Other short-term borrowed funds |  |  |
Short-term Debt [Line Items] |  |  |
Total short-term borrowed funds | [1] | 1,653 | 1,856
CBNA Global Bank Note Program |  |  |
Short-term Debt [Line Items] |  |  |
Total short-term borrowed funds |  | 1,500 | 750
Unamortized deferred issuance costs and discounts |  | (1) | (1)
Other basis adjustments |  | $ (8) | $ (4)
[1] | December 31, 2018 includes $1.5 billion of debt issued under CBNA’s Global Bank Note Program maturing within one year, with unamortized deferred issuance costs and/or discounts of ($1) million and other basis adjustments of ($8) million. December 31, 2017 includes $750 million of debt issued under CBNA’s Global Bank Note Program maturing within one year, with unamortized deferred issuance costs and/or discounts of ($1) million and other basis adjustments of ($4) million.

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