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Leases - Future Minimum Lease Payments (Detail) - Tampa Electric [Member] - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Lessee, Lease, Description [Line Items]    
Minimum lease payments, 2023 $ 3  
Minimum lease payments, 2024 3  
Minimum lease payments, 2025 2  
Minimum lease payments, 2026 1  
Minimum lease payments, 2027 1  
Minimum lease payments, Thereafter 46  
Minimum lease payments, Total 56  
Less imputed interest (32)  
Total lease liabilities $ 24 $ 25