Consolidated Statements of Capitalization - Long-Term Debt - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term debt, total	$ 4,275	$ 3,775
Unamortized debt discount, net	(14)	(11)
Debt issuance costs	(28)	(30)
Long-term debt, carrying amount	4,233	3,734
Less amount due within one year	300	0
Total long-term debt	3,933	3,734
Long-term debt, fair value	3,831	3,234
LongTerm Debt Reclassification [Member]
Debt Instrument [Line Items]
Long-term debt, total	500	0
Tampa Electric [Member]
Debt Instrument [Line Items]
Long-term debt, total	$ 3,775	3,205
Tampa Electric [Member] | 3.88% Notes [Member]
Debt Instrument [Line Items]
Due	2024
Long-term debt, total	$ 300	263
Tampa Electric [Member] | 2.40% Notes [Member]
Debt Instrument [Line Items]
Due	2031
Long-term debt, total	$ 400	285
Tampa Electric [Member] | 6.55% Notes [Member]
Debt Instrument [Line Items]
Due	2036
Long-term debt, total	$ 250	250
Tampa Electric [Member] | 6.15% Notes [Member]
Debt Instrument [Line Items]
Due	2037
Long-term debt, total	$ 250	190
Tampa Electric [Member] | 4.10% Notes [Member]
Debt Instrument [Line Items]
Due	2042
Long-term debt, total	$ 300	250
Tampa Electric [Member] | 4.35% Notes [Member]
Debt Instrument [Line Items]
Due	2044
Long-term debt, total	$ 300	290
Tampa Electric [Member] | 4.20% Notes [Member]
Debt Instrument [Line Items]
Due	2045
Long-term debt, total	$ 250	230
Tampa Electric [Member] | 4.30% Notes [Member]
Debt Instrument [Line Items]
Due	2048
Long-term debt, total	$ 350	275
Tampa Electric [Member] | 4.45% Notes [Member]
Debt Instrument [Line Items]
Due	2049
Long-term debt, total	$ 375	350
Tampa Electric [Member] | 3.63% Notes [Member]
Debt Instrument [Line Items]
Due	2050
Long-term debt, total	$ 300	275
Tampa Electric [Member] | 3.45% Notes [Member]
Debt Instrument [Line Items]
Due	2051
Long-term debt, total	$ 400	285
Tampa Electric [Member] | 5.00% Notes [Member]
Debt Instrument [Line Items]
Due	2052
Long-term debt, total	$ 300	262
PGS [Member]
Debt Instrument [Line Items]
Long-term debt, total	$ 0	570
PGS [Member] | 3.88% Notes [Member]
Debt Instrument [Line Items]
Due	2024
Long-term debt, total	$ 0	38
PGS [Member] | 2.40% Notes [Member]
Debt Instrument [Line Items]
Due	2031
Long-term debt, total	$ 0	115
PGS [Member] | 6.15% Notes [Member]
Debt Instrument [Line Items]
Due	2037
Long-term debt, total	$ 0	60
PGS [Member] | 4.10% Notes [Member]
Debt Instrument [Line Items]
Due	2042
Long-term debt, total	$ 0	50
PGS [Member] | 4.35% Notes [Member]
Debt Instrument [Line Items]
Due	2044
Long-term debt, total	$ 0	10
PGS [Member] | 4.20% Notes [Member]
Debt Instrument [Line Items]
Due	2045
Long-term debt, total	$ 0	20
PGS [Member] | 4.30% Notes [Member]
Debt Instrument [Line Items]
Long-term debt, total	0	75
PGS [Member] | 4.45% Notes [Member]
Debt Instrument [Line Items]
Long-term debt, total	$ 0	25
PGS [Member] | 3.63% Notes [Member]
Debt Instrument [Line Items]
Due	2050
Long-term debt, total	$ 0	25
PGS [Member] | 3.45% Notes [Member]
Debt Instrument [Line Items]
Due	2051
Long-term debt, total	$ 0	115
PGS [Member] | 5.00% Notes [Member]
Debt Instrument [Line Items]
Due	2052
Long-term debt, total	$ 0	$ 37