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Short Term Debt (Narrative) (Details) $ in Millions, $ in Millions |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2019 USD ($) | Dec. 16, 2019 CAD ($) | Mar. 07, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Feb. 06, 2020 USD ($) | Dec. 20, 2019 USD ($) | Dec. 31, 2018 CAD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Weighted average interest rate |  |  |  | 2.54% |  |  | 3.34%
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 2,463 |  |  | $ 2,065
Revolving credit facility | TECO Energy/TECO Finance |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  | Mar. 22, 2022 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 520 |  |  | 546
Revolving credit facility | Tampa Electric Company |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date | Feb. 04, 2021 |  |  | Mar. 22, 2022 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 325 |  |  | $ 520 | $ 300 | $ 400 | 443
Line of Credit Facility, Increase (Decrease), Net | $ 75 |  |  |  |  |  |
Revolving credit facility | NMGC |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  | Mar. 22, 2022 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 162 |  |  | 171
Revolving credit facility | GBPC |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 17 |  |  | 18
Accounts receivable revolving credit facility | Tampa Electric Company |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  | Dec. 31, 2021 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 195 |  |  | 205
Term bank credit facility | TECO Energy/TECO Finance |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  | Dec. 31, 2020 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 649 |  |  | $ 682
Non-revolving term credit facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  | Dec. 15, 2020 |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 400 |  |  |  |  |
Non-revolving term credit facility | TECO Energy/TECO Finance |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  | Mar. 05, 2020 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 500 |  |  |  |

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