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BORROWED FUNDS - Long Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term borrowed funds |  | $ 14,433 | $ 11,765
5.158% fixed-to-floating rate subordinated debt, callable, due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 5.158% |
Parent company |  |  |
Debt Instrument [Line Items] |  |  |
Long-term borrowed funds |  | $ 1,987 |
Banking Subsidiaries |  |  |
Debt Instrument [Line Items] |  |  |
Long-term borrowed funds |  | $ 12,446 |
Senior Unsecured Notes | Parent company | 2.375% fixed rate senior unsecured debt, due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 2.375% |
Long-term borrowed funds |  | $ 349 | 349
Senior Unsecured Notes | Banking Subsidiaries | 2.450% senior unsecured notes, due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 2.45% |
Long-term borrowed funds | [1],[2] | $ 0 | 743
Senior Unsecured Notes | Banking Subsidiaries | 2.500% senior unsecured notes, due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 2.50% |
Long-term borrowed funds | [1],[2] | $ 0 | 741
Senior Unsecured Notes | Banking Subsidiaries | 2.250% senior unsecured notes, due 2020 (1) |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 2.25% |
Long-term borrowed funds | [1] | $ 691 | 692
Senior Unsecured Notes | Banking Subsidiaries | 3.278% floating rate senior unsecured notes, due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.278% |
Long-term borrowed funds | [1],[3] | $ 300 | 299
Senior Unsecured Notes | Banking Subsidiaries | 3.247% floating rate senior unsecured notes, due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.247% |
Long-term borrowed funds | [1],[3] | $ 250 | 249
Senior Unsecured Notes | Banking Subsidiaries | 2.200% senior unsecured notes, due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 2.20% |
Long-term borrowed funds | [1] | $ 499 | 498
Senior Unsecured Notes | Banking Subsidiaries | 2.250% senior unsecured notes, due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 2.25% |
Long-term borrowed funds | [1] | $ 738 | 742
Senior Unsecured Notes | Banking Subsidiaries | 2.550% senior unsecured notes, due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 2.55% |
Long-term borrowed funds | [1] | $ 964 | 964
Senior Unsecured Notes | Banking Subsidiaries | 3.487% floating-rate senior unsecured notes, due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.487% |
Long-term borrowed funds | [1],[3] | $ 249 | 249
Senior Unsecured Notes | Banking Subsidiaries | 2.650% senior unsecured notes, due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 2.65% |
Long-term borrowed funds | [1] | $ 487 | 491
Senior Unsecured Notes | Banking Subsidiaries | 3.700% senior unsecured notes, due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.70% |
Long-term borrowed funds | [1] | $ 502 | 0
Senior Unsecured Notes | Banking Subsidiaries | 3.753% floating-rate senior unsecured notes, due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.753% |
Long-term borrowed funds | [1],[3] | $ 249 | 0
Subordinated Debt | Parent company | 4.150% fixed rate subordinated debt, due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 4.15% |
Long-term borrowed funds |  | $ 348 | 348
Subordinated Debt | Parent company | 5.158% fixed-to-floating rate subordinated debt, callable, due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 5.158% |
Long-term borrowed funds | [4] | $ 0 | 333
Subordinated Debt | Parent company | 3.750% fixed rate subordinated debt due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.75% |
Long-term borrowed funds |  | $ 250 | 250
Subordinated Debt | Parent company | 4.023% fixed rate subordinated debt, due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 4.023% |
Long-term borrowed funds |  | $ 42 | 42
Subordinated Debt | Parent company | 4.350% fixed rate subordinated debt, due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 4.35% |
Long-term borrowed funds |  | $ 249 | 249
Subordinated Debt | Parent company | 4.300% fixed rate subordinated debt, due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 4.30% |
Long-term borrowed funds |  | $ 749 | 749
Federal Home Loan advances | Banking Subsidiaries |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 2.725% |
Long-term borrowed funds |  | $ 7,508 | 3,761
Other | Banking Subsidiaries |  |  |
Debt Instrument [Line Items] |  |  |
Long-term borrowed funds |  | $ 9 | $ 16
[1] | Issued under CBNA’s Global Bank Note Program.
[2] | Reclassified to short-term borrowed funds.
[3] | Rate disclosed reflects the floating rate as of December 31, 2018.
[4] | Redeemed on June 29, 2018.

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