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Short-term Borrowings and Long-term Debt - Schedule of Maturities (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Houston Electric  
Debt Instrument [Line Items]  
2023 $ 156
2024 161
2025 0
2026 300
2027 300
CERC Corp  
Debt Instrument [Line Items]  
2023 1,832
2024 0
2025 10
2026 60
2027 831
Long term Debt Excluding ZENS  
Debt Instrument [Line Items]  
2023 1,999
2024 1,384
2025 51
2026 860
2027 2,901
Securitization Bonds  
Debt Instrument [Line Items]  
2023 156
2024 161
2025 0
2026 0
2027 $ 0