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Revenue - Summary of Disaggregates TEC Revenue by Major Source (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation Of Revenue [Line Items]        
Total electric revenue $ 558 $ 593 $ 1,489 $ 1,563
Total gas revenue 96 104 331 350
Total revenue 654 697 1,820 1,913
Residential [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 325 331 792 802
Total gas revenue 30 29 116 120
Commercial [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 160 163 421 435
Total gas revenue 32 34 109 115
Industrial [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 41 43 117 121
Total gas revenue 5 4 16 15
Regulatory Deferrals and Unbilled Revenue [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue (31) (10) (21) 13
Other [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 63 66 180 192
Total gas revenue 29 37 90 100
Tampa Electric [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 559 594 1,492 1,565
Total gas revenue 0 0 0 0
Total revenue 559 594 1,492 1,565
Tampa Electric [Member] | Residential [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 325 331 792 802
Total gas revenue 0 0 0 0
Tampa Electric [Member] | Commercial [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 160 163 421 435
Total gas revenue 0 0 0 0
Tampa Electric [Member] | Industrial [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 41 43 117 121
Total gas revenue 0 0 0 0
Tampa Electric [Member] | Regulatory Deferrals and Unbilled Revenue [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue (31) (10) (21) 13
Tampa Electric [Member] | Other [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 64 67 183 194
Total gas revenue 0 0 0 0
PGS [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 0 0 0 0
Total gas revenue 101 111 344 368
Total revenue 101 111 344 368
PGS [Member] | Residential [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 0 0 0 0
Total gas revenue 30 29 116 120
PGS [Member] | Commercial [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 0 0 0 0
Total gas revenue 32 34 109 115
PGS [Member] | Industrial [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 0 0 0 0
Total gas revenue 5 4 16 15
PGS [Member] | Regulatory Deferrals and Unbilled Revenue [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 0 0 0 0
PGS [Member] | Other [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 0 0 0 0
Total gas revenue 34 44 103 118
Eliminations [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue (1) (1) (3) (2)
Total gas revenue (5) (7) (13) (18)
Total revenue (6) (8) (16) (20)
Eliminations [Member] | Residential [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 0 0 0 0
Total gas revenue 0 0 0 0
Eliminations [Member] | Commercial [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 0 0 0 0
Total gas revenue 0 0 0 0
Eliminations [Member] | Industrial [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 0 0 0 0
Total gas revenue 0 0 0 0
Eliminations [Member] | Regulatory Deferrals and Unbilled Revenue [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue 0 0 0 0
Eliminations [Member] | Other [Member]        
Disaggregation Of Revenue [Line Items]        
Total electric revenue (1) (1) (3) (2)
Total gas revenue $ (5) $ (7) $ (13) $ (18)