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Short Term Debt (Short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity) (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 ($) | Dec. 20, 2019 USD ($) | Jun. 13, 2019 CAD ($) | Dec. 31, 2018 CAD ($)
Short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity |  |  |  |  |  |  |  |
Total available capacity |  |  |  | $ 2,463 |  |  |  | $ 2,065
Advances under revolving credit and term facilities |  |  |  | 1,525 |  |  |  | 1,186
Letters of credit issued within the credit facilities |  |  |  | 3 |  |  |  | 3
Total advances under available facilities |  |  |  | 1,528 |  |  |  | 1,189
Available capacity under existing agreements |  |  |  | $ 935 |  |  |  | 876
Parent Company [Member] |  |  |  |  |  |  |  |
Short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity |  |  |  |  |  |  |  |
Total available capacity |  |  |  |  |  |  | $ 900 |
Term credit facility | TECO Energy/TECO Finance |  |  |  |  |  |  |  |
Short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity |  |  |  |  |  |  |  |
Maturity |  |  |  | Dec. 31, 2020 |  |  |  |
Total available capacity |  |  |  | $ 649 |  |  |  | 682
Revolving credit facility | TECO Energy/TECO Finance |  |  |  |  |  |  |  |
Short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity |  |  |  |  |  |  |  |
Maturity |  |  |  | Mar. 22, 2022 |  |  |  |
Total available capacity |  |  |  | $ 520 |  |  |  | 546
Revolving credit facility | Tampa Electric Company |  |  |  |  |  |  |  |
Short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity |  |  |  |  |  |  |  |
Maturity | Feb. 04, 2021 |  |  | Mar. 22, 2022 |  |  |  |
Total available capacity | $ 325 |  |  | $ 520 | $ 300 | $ 400 |  | 443
Revolving credit facility | NMGC |  |  |  |  |  |  |  |
Short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity |  |  |  |  |  |  |  |
Maturity |  |  |  | Mar. 22, 2022 |  |  |  |
Total available capacity |  |  |  | $ 162 |  |  |  | 171
Revolving credit facility | GBPC |  |  |  |  |  |  |  |
Short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity |  |  |  |  |  |  |  |
Total available capacity |  |  |  | $ 17 |  |  |  | 18
Non-revolving term credit facility |  |  |  |  |  |  |  |
Short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity |  |  |  |  |  |  |  |
Maturity |  | Dec. 15, 2020 |  |  |  |  |  |
Total available capacity |  | $ 400 |  |  |  |  |  |
Non-revolving term credit facility | TECO Energy/TECO Finance |  |  |  |  |  |  |  |
Short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity |  |  |  |  |  |  |  |
Maturity |  |  | Mar. 05, 2020 |  |  |  |  |
Total available capacity |  |  | $ 500 |  |  |  |  |
Non-revolving term credit facility | Parent Company [Member] |  |  |  |  |  |  |  |
Short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity |  |  |  |  |  |  |  |
Maturity |  |  |  | Dec. 31, 2020 |  |  |  |
Total available capacity |  |  |  | $ 400 |  |  |  | 0
Accounts receivable revolving credit facility | Tampa Electric Company |  |  |  |  |  |  |  |
Short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity |  |  |  |  |  |  |  |
Maturity |  |  |  | Dec. 31, 2021 |  |  |  |
Total available capacity |  |  |  | $ 195 |  |  |  | $ 205

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- Definition Advances against the line of credit facility which can be made by way of overdraft. + References No definition available. + Details
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- Definition Amount of borrowed funds under the facility. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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