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Short Term Debt (short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Short term debt revolving and non revolving credit facility [Member]    
Short-term Debt [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 2,065 $ 2,024
Credit Facility Advances 1,186 1,241
Letters of Credit Outstanding, Amount 3 3
Total advances under available facilities 1,189 1,244
Available capacity under existing agreements 876 780
TECO Energy Inc. and TECO Finance Inc. [Member] | Revolving Credit Facility [Member]    
Short-term Debt [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 546 376
Line of Credit Facility, Expiration Date Mar. 22, 2022  
TECO Energy Inc. and TECO Finance Inc. [Member] | Finance Term Credit Facility [Member]    
Short-term Debt [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 682 502
Line of Credit Facility, Expiration Date Mar. 22, 2019  
Tampa Electric Division [Member] | Revolving Credit Facility [Member]    
Short-term Debt [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 443 408
Line of Credit Facility, Expiration Date Mar. 22, 2022  
Tampa Electric Division [Member] | Accounts Receivable Revolving Credit Facility    
Short-term Debt [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 205 188
Line of Credit Facility, Expiration Date Dec. 31, 2021  
Tampa Electric Division [Member] | Finance Term Credit Facility [Member]    
Short-term Debt [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 0 377
Line of Credit Facility, Expiration Date Dec. 31, 2018  
New Mexico Gas Company [Member] | Revolving Credit Facility [Member]    
Short-term Debt [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 171 157
Line of Credit Facility, Expiration Date Mar. 22, 2022  
Grand Bahama Power Company Limited [Member] | Revolving Credit Facility [Member]    
Short-term Debt [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 18 $ 16
Line of Credit Facility, Expiration Date Dec. 31, 2019