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Short-term Borrowings and Long-term Debt - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 01, 2023
$ / shares
Jun. 30, 2024
USD ($)
May 31, 2024
USD ($)
Feb. 29, 2024
USD ($)
Mar. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
shares
Jun. 28, 2024
USD ($)
Dec. 31, 2023
USD ($)
Debt Instrument [Line Items]                
Debt instrument, convertible, conversion ratio 27.1278              
Conversion price percentage 25.00%              
Maximum                
Debt Instrument [Line Items]                
Debt instrument, convertible, conversion ratio           33.9097    
Debt instrument, convertible, number of equity instruments (in shares) | shares           33,909,700    
Convertible Debt                
Debt Instrument [Line Items]                
Debt instrument, convertible, conversion price (in dollar per shares) | $ / shares $ 36.86              
Debt instrument, redemption price (as a percent) 100.00%              
Senior Notes Due 2029                
Debt Instrument [Line Items]                
Debt instrument, face amount     $ 700          
Debt instrument, interest rate, stated percentage     5.40%          
Proceeds from issuance of long-term debt and capital securities, net     $ 693          
First Mortgage Bonds 3.50% Due 2024 | SIGECO                
Debt Instrument [Line Items]                
Debt instrument, interest rate, stated percentage         3.50%      
Debt instrument, redemption price, principal amount redeemed         $ 22      
Debt instrument, redemption price, percentage of principal amount redeemed         100.00%      
Senior Notes Due 2024                
Debt Instrument [Line Items]                
Debt instrument, redemption price, principal amount redeemed     $ 350          
Debt instrument, redemption price, percentage of principal amount redeemed     100.00%          
CERC | Senior Notes Due 2034                
Debt Instrument [Line Items]                
Debt instrument, face amount   $ 400       $ 400    
Debt instrument, interest rate, stated percentage   5.40%       5.40%    
Proceeds from issuance of long-term debt and capital securities, net   $ 396            
Houston Electric | General Mortgage Bonds                
Debt Instrument [Line Items]                
Secured debt   8,000       $ 8,000    
General mortgage bonds used as collateral   $ 68       $ 68    
Percentage of property additions   70.00%       70.00%    
Additional first mortgage bonds and general mortgage bonds that could be issued   $ 4,900       $ 4,900    
Percentage of property additions (as a percent)   70.00%       70.00%    
Houston Electric | General Mortgage Bonds 5.15% Due 2034 | General Mortgage Bonds                
Debt Instrument [Line Items]                
Debt instrument, face amount       $ 400        
Debt instrument, interest rate, stated percentage       5.15%        
Proceeds from issuance of long-term debt and capital securities, net       $ 395        
Houston Electric | Delayed Draw Term Loan (DDTL)                
Debt Instrument [Line Items]                
Debt instrument, face amount   $ 300       $ 300    
Additional borrowing capacity   $ 200       200    
Size of Facility             $ 100  
Basis spread on variable rate (as a percent)   1.00%            
Debt Instrument, Interest Rate, Stated Percentage, Annual Adjustment   0.10%            
SIGECO | First Mortgage Bonds                
Debt Instrument [Line Items]                
Secured debt   $ 825       825    
Additional first mortgage bonds and general mortgage bonds that could be issued   $ 926       $ 926    
Percentage of property additions (as a percent)   70.00%       70.00%    
Third Party AMAs                
Debt Instrument [Line Items]                
Inventory financings   $ 2       $ 2   $ 4
Third Party AMAs | CERC                
Debt Instrument [Line Items]                
Inventory financings   $ 2       $ 2   $ 4