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Commitments and Contingencies (Legal Proceedings) (Details)
$ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Oct. 16, 2020
USD ($)
May 13, 2020
USD ($)
Nov. 30, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2020
USD ($)
Loss Contingencies [Line Items]              
Litigation Settlement, Amount       $ 49   $ 0  
Prime Rate [Member] | Tampa Electric              
Loss Contingencies [Line Items]              
Loss Contingency, Estimate of Possible Loss       $ 22     $ 17
Prime Rate [Member] | TGH              
Loss Contingencies [Line Items]              
Litigation Settlement, Amount         $ 21    
Litigation Settlement Variable Rate       2.00% 2.00%    
United States Free Trade Agreement Award One [Member] | TGH              
Loss Contingencies [Line Items]              
Proceeds from settlement of claims     $ 38        
United States Free Trade Agreement Award two [Member] | TGH              
Loss Contingencies [Line Items]              
Litigation Settlement, Amount   $ 35     $ 59    
Litigation Settlement Interest $ 2