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Employee Postretirement Benefits - Schedule of Benefit Payments (Detail) - TECO Energy [Member]
$ in Millions
Dec. 31, 2022
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected Benefit Payments - 2023 $ 68
Expected Benefit Payments - 2024 64
Expected Benefit Payments - 2025 66
Expected Benefit Payments - 2026 66
Expected Benefit Payments - 2027 66
Expected Benefit Payments - 2028-2032 304
Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected Benefit Payments - 2023 14
Expected Benefit Payments - 2024 14
Expected Benefit Payments - 2025 14
Expected Benefit Payments - 2026 14
Expected Benefit Payments - 2027 14
Expected Benefit Payments - 2028-2032 $ 63