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ACQUISITIONS AND DISPOSITIONS - Schedule of Estimated Preliminary Fair Values Assigned to Net Assets (Details)
$ in Millions
Sep. 30, 2024
CAD ($)
Sep. 30, 2024
USD ($)
May 31, 2024
CAD ($)
May 31, 2024
USD ($)
Mar. 06, 2024
CAD ($)
Mar. 06, 2024
USD ($)
Jan. 02, 2024
CAD ($)
Promissorynote
Jan. 02, 2024
USD ($)
Sep. 30, 2025
CAD ($)
Dec. 31, 2024
CAD ($)
Jan. 02, 2024
USD ($)
Promissorynote
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]                      
Goodwill                 $ 35,684,000,000 $ 36,600,000,000  
Public Service Company of North Carolina, Incorporated                      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]                      
Current assets $ 303,000,000                    
Property, plant and equipment 4,147,000,000                    
Long-term assets 189,000,000                    
Current liabilities 277,000,000                    
Long-term debt 1,529,000,000                    
Other long-term liabilities 653,000,000                    
Deferred income tax liabilities 365,000,000                    
Goodwill 895,000,000                    
Purchase price:                      
Cash 2,710,000,000                    
Deferred consideration                      
Purchase price 2,700,000,000 $ 2,000                  
Expected credit loss 2,000,000                    
Regulatory assets 114,000,000                    
Fair value adjustment of long-term debt 156,000,000                    
Fair value adjustment of regulatory offset 0                    
Public Service Company of North Carolina, Incorporated | Carrying Value                      
Deferred consideration                      
Trade receivables $ 70,000,000                    
Questar Gas Company                      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]                      
Current assets     $ 380,000,000                
Property, plant and equipment     6,013,000,000                
Long-term assets     163,000,000                
Current liabilities     416,000,000                
Long-term debt     1,343,000,000                
Other long-term liabilities     919,000,000                
Deferred income tax liabilities     527,000,000                
Goodwill     793,000,000                
Purchase price:                      
Cash     4,144,000,000                
Deferred consideration                      
Purchase price     4,100,000,000 $ 3,000              
Expected credit loss     9,000,000                
Fair value adjustment of long-term debt     301,000,000                
Fair value adjustment of regulatory offset     0                
Questar Gas Company | Carrying Value                      
Deferred consideration                      
Trade receivables     $ 202,000,000                
EOG Acquisition                      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]                      
Current assets         $ 493,000,000            
Property, plant and equipment         7,276,000,000            
Long-term assets         1,689,000,000            
Current liabilities         551,000,000            
Long-term debt         2,612,000,000            
Other long-term liabilities         1,001,000,000            
Deferred income tax liabilities         1,045,000,000            
Goodwill         1,603,000,000            
Purchase price:                      
Cash         5,852,000,000            
Deferred consideration                      
Purchase price         5,800,000,000 $ 4,300          
Expected credit loss         3,000,000            
Overfunded pension plan assets         367,000,000            
Regulatory assets         1,200,000,000            
Fair value adjustment of long-term debt         478,000,000            
Fair value adjustment of regulatory offset         0            
EOG Acquisition | Carrying Value                      
Deferred consideration                      
Trade receivables         $ 379,000,000            
RNG Facilities                      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]                      
Current assets             $ 31,000,000        
Intangible assets             925,000,000        
Property, plant and equipment             174,000,000        
Current liabilities             5,000,000        
Goodwill             223,000,000        
Purchase price:                      
Cash             584,000,000 $ 439      
Deferred consideration                      
Current portion of long-term debt             550,000,000        
Long-term debt             207,000,000        
Other adjustments             7,000,000        
Purchase price             $ 1,348,000,000 $ 1,000      
Amortized on a straight-line basis over an weighted-average useful life (in years)             9 years 9 years      
Goodwill expected tax deductible period (in years)             15 years 15 years      
Number of non-interest promissory notes | Promissorynote             6       6
Remaining consideration payable, payment period (in years)             2 years 2 years      
Consideration transferred, liabilities incurred             $ 757,000,000 $ 568      
RNG Facilities | Non-Interest Bearing Promissory Notes | Notes Payable, Other Payables                      
Deferred consideration                      
Deferred payments             $ 808,000,000       $ 606
RNG Facilities | Minimum                      
Deferred consideration                      
Amortized on a straight-line basis over an expected useful life (in years)             13 years 13 years      
RNG Facilities | Maximum                      
Deferred consideration                      
Amortized on a straight-line basis over an expected useful life (in years)             42 years 42 years