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BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Hedging basis adjustments |  | $ 357 |  | $ 693
Short-term borrowed funds |  | 1,825 |  | 2,671
Available borrowing capacity |  | 39,100 |  |
Debt redeemed |  | 7,584 | $ 9,751 |
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term borrowed funds |  | 10,800 |  | 9,400
Federal Home Loan advances |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available borrowing capacity |  | 7,000 |  | 8,000
Parent Company |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal balance |  | 2,000 |  | 2,300
Unamortized deferred issuance costs and/or discounts |  | (5) |  | (5)
Banking Subsidiaries |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal balance |  | 11,800 |  | 9,500
Unamortized deferred issuance costs and/or discounts |  | (18) |  | (19)
Hedging basis adjustments |  | $ (100) |  | $ (63)
5.158% fixed-to-floating rate callable subordinated debt | Parent Company | Subordinated Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt redeemed | $ 333 |  |  |
Interest rate | 5.158% |  |  |

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