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Employee Postretirement Benefits - Schedule of Benefit Payments (Detail) - TECO Energy [Member]
$ in Millions
Dec. 31, 2023
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected Benefit Payments - 2024 $ 76
Expected Benefit Payments - 2025 67
Expected Benefit Payments - 2026 66
Expected Benefit Payments - 2027 66
Expected Benefit Payments - 2028 65
Expected Benefit Payments - 2029-2033 295
Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected Benefit Payments - 2024 12
Expected Benefit Payments - 2025 12
Expected Benefit Payments - 2026 12
Expected Benefit Payments - 2027 12
Expected Benefit Payments - 2028 11
Expected Benefit Payments - 2029-2033 $ 51