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Preferred Stock	12 Months Ended
Preferred Stock	Dec. 31, 2015
Equity [Abstract]
Preferred Stock	8. Preferred Stock Preferred stock of TECO Energy – $1 par 10 million shares authorized, none outstanding. Preference stock (subordinated preferred stock) of Tampa Electric – no par 2.5 million shares authorized, none outstanding. Preferred stock of Tampa Electric – no par 2.5 million shares authorized, none outstanding. Preferred stock of Tampa Electric – $100 par 1.5 million shares authorized, none outstanding.