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Short-term Borrowings and Long-term Debt - Schedule of Revolving Credit Facilities (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2023
USD ($)
Debt Instrument [Line Items]  
Aggregate principal amount $ 4,000
Houston Electric  
Debt Instrument [Line Items]  
Aggregate principal amount 300
Restoration costs 100
CERC  
Debt Instrument [Line Items]  
Aggregate principal amount $ 1,050
Line of Credit | Maximum  
Debt Instrument [Line Items]  
Percentage on limitation of debt to total capitalization under covenant amended (in hundredths) (as a percent) 70.00%
Line of Credit | Houston Electric  
Debt Instrument [Line Items]  
Ratio of indebtedness to net capital (as a percent) 0.675
Percentage on limitation of debt to total capitalization under covenant (as a percent) 52.40%
Consecutive period for system restoration costs to exceed $100 million (in months) 12 months
Line of Credit | Houston Electric | Maximum  
Debt Instrument [Line Items]  
Percentage on limitation of debt to total capitalization under covenant amended (in hundredths) (as a percent) 70.00%
Line of Credit | CERC  
Debt Instrument [Line Items]  
Ratio of indebtedness to net capital (as a percent) 0.650
Percentage on limitation of debt to total capitalization under covenant (as a percent) 38.20%
Line of Credit | SOFR Plus | Houston Electric  
Debt Instrument [Line Items]  
Basis spread on variable rate (as a percent) 1.25%
Line of Credit | SOFR Plus | CERC  
Debt Instrument [Line Items]  
Basis spread on variable rate (as a percent) 1.125%
Parent Company  
Debt Instrument [Line Items]  
Aggregate principal amount $ 2,400
Parent Company | Line of Credit  
Debt Instrument [Line Items]  
Ratio of indebtedness to net capital (as a percent) 0.650
Percentage on limitation of debt to total capitalization under covenant (as a percent) 59.20%
Parent Company | Line of Credit | SOFR Plus  
Debt Instrument [Line Items]  
Basis spread on variable rate (as a percent) 1.50%
SIGECO  
Debt Instrument [Line Items]  
Aggregate principal amount $ 250
SIGECO | Line of Credit  
Debt Instrument [Line Items]  
Ratio of indebtedness to net capital (as a percent) 0.650
Percentage on limitation of debt to total capitalization under covenant (as a percent) 43.80%
SIGECO | Line of Credit | SOFR Plus  
Debt Instrument [Line Items]  
Basis spread on variable rate (as a percent) 1.125%