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BORROWED FUNDS - Long Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jun. 29, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds |  | $ 15,639 |  | $ 11,765
Parent Company |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds |  | 1,987 |  |
Parent Company | Subordinated Debt | 4.150% fixed-rate subordinated debt, due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds |  | $ 348 |  | 348
Interest rate |  | 4.15% |  |
Parent Company | Subordinated Debt | 5.158% fixed-to-floating rate callable subordinated debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds | [1] | $ 0 |  | 333
Interest rate |  |  | 5.158% |
Parent Company | Subordinated Debt | 3.750% fixed-rate subordinated debt, due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds |  | $ 250 |  | 250
Interest rate |  | 3.75% |  |
Parent Company | Subordinated Debt | 4.023% fixed-rate subordinated debt, due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds |  | $ 42 |  | 42
Interest rate |  | 4.023% |  |
Parent Company | Subordinated Debt | 4.350% fixed-rate subordinated debt, due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds |  | $ 249 |  | 249
Interest rate |  | 4.35% |  |
Parent Company | Subordinated Debt | 4.300% fixed-rate subordinated debt, due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds |  | $ 749 |  | 749
Interest rate |  | 4.30% |  |
Parent Company | Senior Unsecured Notes | 2.375% fixed-rate senior unsecured debt, due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds |  | $ 349 |  | 349
Interest rate |  | 2.375% |  |
Banking Subsidiaries |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds |  | $ 13,652 |  |
Banking Subsidiaries | Senior Unsecured Notes | 2.450% senior unsecured notes, due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds | [2] | $ 742 |  | 743
Interest rate |  | 2.45% |  |
Banking Subsidiaries | Senior Unsecured Notes | 2.500% senior unsecured notes, due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds | [2],[3] | $ 0 |  | 741
Interest rate |  | 2.50% |  |
Banking Subsidiaries | Senior Unsecured Notes | 2.250% senior unsecured notes, due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds | [2] | $ 687 |  | 692
Interest rate |  | 2.25% |  |
Banking Subsidiaries | Senior Unsecured Notes | Floating-rate senior unsecured notes, due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds | [2] | $ 300 |  | 299
Banking Subsidiaries | Senior Unsecured Notes | Floating-rate senior unsecured notes, due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds | [2] | 250 |  | 249
Banking Subsidiaries | Senior Unsecured Notes | 2.200% senior unsecured notes, due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds | [2] | $ 499 |  | 498
Interest rate |  | 2.20% |  |
Banking Subsidiaries | Senior Unsecured Notes | 2.250% senior unsecured notes, due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds | [2] | $ 731 |  | 742
Interest rate |  | 2.25% |  |
Banking Subsidiaries | Senior Unsecured Notes | 2.550% senior unsecured notes, due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds | [2] | $ 951 |  | 964
Interest rate |  | 2.55% |  |
Banking Subsidiaries | Senior Unsecured Notes | Floating-rate senior unsecured notes, due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds | [2] | $ 249 |  | 249
Banking Subsidiaries | Senior Unsecured Notes | 2.650% senior unsecured notes, due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds | [2] | $ 478 |  | 491
Interest rate |  | 2.65% |  |
Banking Subsidiaries | Senior Unsecured Notes | 3.700% senior unsecured notes, due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds | [2] | $ 492 |  | 0
Interest rate |  | 3.70% |  |
Banking Subsidiaries | Senior Unsecured Notes | Floating-rate senior unsecured notes, due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds | [2] | $ 249 |  | 0
Banking Subsidiaries | Federal Home Loan Bank advances |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds |  | 8,012 |  | 3,761
Banking Subsidiaries | Other |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowed funds |  | $ 12 |  | $ 16
[1] | Redeemed on June 29, 2018.
[2] | Issued under CBNA’s Global Bank Note Program.
[3] | Reclassified to short-term borrowed funds.

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