Consolidated Statements of Capitalization - Long-Term Debt (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Jul. 12, 2022	Mar. 18, 2021
Debt Instrument [Line Items]
Long-term debt, total	$ 4,275	$ 3,775
2.40% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate				2.40%
3.45% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate				3.45%
5.00% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate			5.00%
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]
Stated interest rate	3.88%
Long-term debt, total	$ 300	263
Tampa Electric [Member] | 2.40% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	2.40%
Long-term debt, total	$ 400	285
Tampa Electric [Member] | 6.55% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	6.55%
Long-term debt, total	$ 250	250
Tampa Electric [Member] | 6.15% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	6.15%
Long-term debt, total	$ 250	190
Tampa Electric [Member] | 4.10% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.10%
Long-term debt, total	$ 300	250
Tampa Electric [Member] | 4.35% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.35%
Long-term debt, total	$ 300	290
Tampa Electric [Member] | 4.20% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.20%
Long-term debt, total	$ 250	230
Tampa Electric [Member] | 4.30% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.30%
Long-term debt, total	$ 350	275
Tampa Electric [Member] | 4.45% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.45%
Long-term debt, total	$ 375	350
Tampa Electric [Member] | 3.63% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	3.63%
Long-term debt, total	$ 300	275
Tampa Electric [Member] | 3.45% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	3.45%
Long-term debt, total	$ 400	285
Tampa Electric [Member] | 5.00% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	5.00%
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]
Stated interest rate	3.88%
Long-term debt, total	$ 0	38
PGS [Member] | 2.40% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	2.40%
Long-term debt, total	$ 0	115
PGS [Member] | 6.15% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	6.15%
Long-term debt, total	$ 0	60
PGS [Member] | 4.10% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.10%
Long-term debt, total	$ 0	50
PGS [Member] | 4.35% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.35%
Long-term debt, total	$ 0	10
PGS [Member] | 4.20% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.20%
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]
Stated interest rate	3.63%
Long-term debt, total	$ 0	25
PGS [Member] | 3.45% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	3.45%
Long-term debt, total	$ 0	115
PGS [Member] | 5.00% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	5.00%
Long-term debt, total	$ 0	$ 37