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Short Term Debt (Narrative) (Details)
CAD in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2016
CAD
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CAD
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity CAD 1,762   CAD 18
Revolving Credit Facility [Member] | Tampa Electric Division [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity CAD 436 $ 325  
Line of Credit Facility, Expiration Date Dec. 17, 2018    
Revolving Credit Facility [Member] | TECO Energy Inc. and TECO Finance Inc. [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity CAD 403 300  
Line of Credit Facility, Expiration Date Dec. 17, 2018    
Accounts Receivable Revolving Credit Facility | Tampa Electric Division [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity CAD 201 150  
Line of Credit Facility, Expiration Date Mar. 23, 2018    
Accounts Receivable Revolving Credit Facility | New Mexico Gas Company [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity CAD 168 125  
Line of Credit Facility, Expiration Date Dec. 17, 2018    
Finance Term Credit Facility [Member] | TECO Energy Inc. and TECO Finance Inc. [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity CAD 537 $ 400  
Line of Credit Facility, Expiration Date Mar. 14, 2017