XML 234 R70.htm IDEA: XBRL DOCUMENT v3.25.0.1
Property, Plant and Equipment (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
MW
Dec. 31, 2022
USD ($)
Property, Plant and Equipment, Net, by Type [Abstract]      
Property, Plant and Equipment, Gross $ 42,667 $ 40,396  
Property plant and equipment and finance lease assets, gross 42,667 40,396  
Accumulated Depreciation & Amortization 10,578 10,543  
Property plant and equipment and finance lease assets, accumulated depreciation and amortization 10,578 10,543  
Property, Plant and Equipment, Net 32,089 29,853  
Finance lease right of use assets, net 430 526  
Property plant and equipment and finance lease assets, net 32,089 29,853  
Depreciation and Amortization [Abstract]      
Depreciation 1,177 1,092 $ 1,013
Amortization of securitized regulatory assets 90 163 191
Other amortization 172 146 84
Total 1,439 1,401 1,288
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Beginning balance 590 610  
Additions 11 0  
Accretion expense 21 23  
Revisions in estimate (34) (43)  
Ending balance 588 $ 590 610
SIGECO      
Property, Plant and Equipment, Net, by Type [Abstract]      
Number of megawatts (in MW) | MW   300  
SIGECO's share of cost of Warrick Unit 4   $ 198  
SIGECO's share of accumulated depreciation of Warrick Unit 4   171  
Houston Electric      
Property, Plant and Equipment, Net, by Type [Abstract]      
Property, Plant and Equipment, Gross 21,750 19,515  
Property plant and equipment and finance lease assets, gross 21,750 19,515  
Accumulated Depreciation & Amortization 4,628 4,469  
Property plant and equipment and finance lease assets, accumulated depreciation and amortization 4,628 4,469  
Property, Plant and Equipment, Net 17,122 15,046  
Finance lease right of use assets, net 430 526  
Property plant and equipment and finance lease assets, net 17,122 15,046  
Depreciation and Amortization [Abstract]      
Depreciation 545 484 434
Amortization of securitized regulatory assets 74 155 191
Other amortization 143 109 45
Total 762 748 670
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Beginning balance 40 36  
Additions 0 0  
Accretion expense 1 1  
Revisions in estimate (2) 3  
Ending balance 39 40 36
CERC      
Property, Plant and Equipment, Net, by Type [Abstract]      
Property, Plant and Equipment, Gross 15,552 15,672  
Property plant and equipment and finance lease assets, gross 15,552 15,672  
Accumulated Depreciation & Amortization 4,146 4,169  
Property plant and equipment and finance lease assets, accumulated depreciation and amortization 4,146 4,169  
Property, Plant and Equipment, Net 11,406 11,503  
Finance lease right of use assets, net 0 0  
Property plant and equipment and finance lease assets, net 11,406 11,503  
Depreciation and Amortization [Abstract]      
Depreciation 492 459 420
Amortization of securitized regulatory assets 0 0 0
Other amortization 30 34 28
Total 522 493 448
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Beginning balance 380 420  
Additions 0 0  
Accretion expense 16 16  
Revisions in estimate (33) (56)  
Ending balance $ 363 380 $ 420
Electric transmission and distribution      
Property, Plant and Equipment, Net, by Type [Abstract]      
Weighted Average Useful Lives (in years) 37 years    
Property, Plant and Equipment, Gross $ 21,387 19,151  
Accumulated Depreciation & Amortization 4,810 4,762  
Property, Plant and Equipment, Net $ 16,577 14,389  
Electric transmission and distribution | Houston Electric      
Property, Plant and Equipment, Net, by Type [Abstract]      
Weighted Average Useful Lives (in years) 37 years    
Property, Plant and Equipment, Gross $ 18,645 16,800  
Accumulated Depreciation & Amortization 3,647 3,641  
Property, Plant and Equipment, Net $ 14,998 13,159  
Electric generation      
Property, Plant and Equipment, Net, by Type [Abstract]      
Weighted Average Useful Lives (in years) 25 years    
Property, Plant and Equipment, Gross $ 1,107 1,381  
Accumulated Depreciation & Amortization 154 315  
Property, Plant and Equipment, Net $ 953 1,066  
Natural gas distribution      
Property, Plant and Equipment, Net, by Type [Abstract]      
Weighted Average Useful Lives (in years) 32 years    
Property, Plant and Equipment, Gross $ 16,399 16,492  
Accumulated Depreciation & Amortization 4,326 4,337  
Property, Plant and Equipment, Net $ 12,073 12,155  
Natural gas distribution | CERC      
Property, Plant and Equipment, Net, by Type [Abstract]      
Weighted Average Useful Lives (in years) 32 years    
Property, Plant and Equipment, Gross $ 15,474 15,591  
Accumulated Depreciation & Amortization 4,118 4,136  
Property, Plant and Equipment, Net $ 11,356 11,455  
Finance ROU asset      
Property, Plant and Equipment, Net, by Type [Abstract]      
Finance Lease, term of contract (in years) 7 years 6 months    
Finance lease right of use assets, gross $ 662 662  
Finance lease right of use assets, accumulated amortization 232 136  
Finance lease right of use assets, net $ 430 526  
Finance ROU asset | Houston Electric      
Property, Plant and Equipment, Net, by Type [Abstract]      
Finance Lease, term of contract (in years) 7 years 6 months    
Finance lease right of use assets, gross $ 662 662  
Finance lease right of use assets, accumulated amortization 232 136  
Finance lease right of use assets, net $ 430 526  
Other property      
Property, Plant and Equipment, Net, by Type [Abstract]      
Weighted Average Useful Lives (in years) 22 years    
Property, Plant and Equipment, Gross $ 3,112 2,710  
Accumulated Depreciation & Amortization 1,056 993  
Property, Plant and Equipment, Net $ 2,056 1,717  
Other property | Houston Electric      
Property, Plant and Equipment, Net, by Type [Abstract]      
Weighted Average Useful Lives (in years) 20 years    
Property, Plant and Equipment, Gross $ 2,443 2,053  
Accumulated Depreciation & Amortization 749 692  
Property, Plant and Equipment, Net $ 1,694 1,361  
Other property | CERC      
Property, Plant and Equipment, Net, by Type [Abstract]      
Weighted Average Useful Lives (in years) 11 years    
Property, Plant and Equipment, Gross $ 78 81  
Accumulated Depreciation & Amortization 28 33  
Property, Plant and Equipment, Net $ 50 $ 48