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Short-term Borrowings and Long-term Debt - Schedule of Maturities (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Houston Electric  
Debt Instrument [Line Items]  
2022 $ 520
2023 356
2024 161
2025 0
2026 300
CERC Corp  
Debt Instrument [Line Items]  
2022 0
2023 1,700
2024 899
2025 0
2026 0
Long term Debt Excluding ZENS  
Debt Instrument [Line Items]  
2022 524
2023 2,113
2024 4,283
2025 51
2026 860
Securitization Bonds  
Debt Instrument [Line Items]  
2022 220
2023 156
2024 161
2025 0
2026 $ 0