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Employee Postretirement Benefits - Schedule of Benefit Payments (Detail) - TECO Energy [Member]
$ in Millions
Dec. 31, 2024
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected Benefit Payments - 2025 $ 70
Expected Benefit Payments - 2026 68
Expected Benefit Payments - 2027 70
Expected Benefit Payments - 2028 69
Expected Benefit Payments - 2029 66
Expected Benefit Payments -2030-2034 296
Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected Benefit Payments - 2025 12
Expected Benefit Payments - 2026 12
Expected Benefit Payments - 2027 12
Expected Benefit Payments - 2028 12
Expected Benefit Payments - 2029 12
Expected Benefit Payments -2030-2034 $ 51