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Consolidated Statements of Capitalization - Long-term Debt Maturities
$ in Millions
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
Total long-term debt maturities $ 2,164
Long Term Debt Maturities  
Debt Instrument [Line Items]  
2018 304
2019 0
2020 0
2021 279
2022 250
Thereafter 1,350
Total long-term debt maturities 2,183
Tampa Electric [Member]  
Debt Instrument [Line Items]  
2018 254
2019 0
2020 0
2021 232
2022 225
Thereafter 1,210
Total long-term debt maturities 1,921
PGS [Member]  
Debt Instrument [Line Items]  
2018 50
2019 0
2020 0
2021 47
2022 25
Thereafter 140
Total long-term debt maturities $ 262