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v3.21.1

Short Term Debt (Narrative) (Details) $ in Millions, $ in Millions | Jan. 29, 2021 | Dec. 18, 2020 USD ($) | Dec. 01, 2020 CAD ($) | Jun. 30, 2020 USD ($) | Apr. 03, 2020 USD ($) | Feb. 28, 2020 USD ($) | Feb. 06, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  | 1.01% | 2.54%
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 2,677 | $ 2,463
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  | 4 | 3
TECO Energy/TECO Finance |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | 0 | 649
Revolving credit facility | TEC |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | 1,019 | 520
Revolving credit facility | NMGC |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | 159 | 162
Revolving credit facility | TECO Energy/TECO Finance |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | 509 | 520
Term loan credit facility | TEC |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 382 | $ 0
Non-revolving credit agreement | TEC |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 300 |  |
Line of Credit Facility, Expiration Date |  |  |  |  |  |  | Feb. 04, 2021 |  |
Non-revolving credit agreement | TEC | Extended Maturity [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date | Apr. 29, 2021 |  |  |  |  |  |  |  |
Non-revolving credit agreement | Emera Inc. |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  | 0.94% | 2.69%
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 400 |  |  |  |  | $ 400 | $ 400
Line of Credit Facility, Expiration Date |  |  | Dec. 15, 2020 |  |  |  |  |  |
Non-revolving credit agreement | Emera Inc. | Extended Maturity [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  | Dec. 16, 2021 |  |  |  |  |  |
Bank credit facility [Member] | TEC |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 400 |  |  |  |  |  |  |
Increased commitment |  | $ 800 |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  | Mar. 22, 2022 |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  | $ 80 |  |  |  |  |  |  |
Bank credit facility [Member] | TEC | Extended Maturity [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  | Mar. 22, 2023 |  |  |  |  |  |  |
Bank credit facility [Member] | NMGC |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 125 |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  | Mar. 22, 2022 |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  | $ 30 |  |  |  |  |  |  |
Bank credit facility [Member] | NMGC | Extended Maturity [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  | Mar. 22, 2023 |  |  |  |  |  |  |
Bank credit facility [Member] | TECO Finance |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 400 |  |  |  | $ 500 |  |  |
Line of Credit Facility, Expiration Date |  | Mar. 22, 2022 |  |  |  | Mar. 05, 2020 |  |  |
Repayments of credit facility |  |  |  | $ 300 | $ 200 |  |  |  |
Letters of Credit Outstanding, Amount |  | $ 50 |  |  |  |  |  |  |
Bank credit facility [Member] | TECO Finance | Extended Maturity [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  | Mar. 22, 2023 |  |  |  | Jul. 03, 2020 |  |  |

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