v3.26.1
Long-Term Debt - Narrative (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2025
CAD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Disclosure of detailed information about borrowings [line items]            
Borrowings   $ 18,819   $ 16,617    
Letters of credit and guarantees outstanding   1,542   840    
Bank credit facilities            
Disclosure of detailed information about borrowings [line items]            
Undrawn borrowing facilities       5,668    
Non-revolving credit facility maturing December 2027            
Disclosure of detailed information about borrowings [line items]            
Borrowings       4,000    
Maximum credit facility   4,000   4,000    
Demand credit facility            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility       100    
Revolving Syndicated Credit Facility Maturing June 2027            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility       500    
Revolving Syndicated Credit Facility Maturing June 2028            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility   2,425   2,425    
Revolving Syndicated Credit Facility            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility   2,425   2,565    
Revolving Syndicated Credit Facility Maturing June 2027            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility       140    
Revolving Credit Facility Maturing June 2029            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility       2,425    
Revolving Credit Facility Maturing February 2026            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility   $ 500        
Revolving Credit Facility Maturing February 2027            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility       $ 500    
Commercial Paper            
Disclosure of detailed information about borrowings [line items]            
Borrowings         $ 0 $ 467
Maximum credit facility         $ 2,500  
Bank Credit Facilities And Commercial Paper Outstanding | Weighted average            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate   5.40%   5.00% 5.00% 5.40%
Long-term debt | Weighted average            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate   4.90%   5.00% 5.00% 4.90%
Medium-term borrowings expiring September 2027            
Disclosure of detailed information about borrowings [line items]            
Base shell prospectus borrowings, authorized       $ 3,000    
Base shelf prospectus borrowings, available         $ 3,003  
3.30% debentures due December 8, 2028            
Disclosure of detailed information about borrowings [line items]            
Borrowings       $ 550    
Borrowings, interest rate       3.30% 3.30%  
3.75% debentures due February 8, 2031            
Disclosure of detailed information about borrowings [line items]            
Borrowings       $ 550    
Borrowings, interest rate       3.75% 3.75%  
4.55% debentures due February 8, 2036            
Disclosure of detailed information about borrowings [line items]            
Borrowings       $ 550    
Borrowings, interest rate       4.55% 4.55%  
Medium-Term Notes            
Disclosure of detailed information about borrowings [line items]            
Base shelf prospectus borrowings, available       $ 1,350    
Medium Term Borrowings 3.55% Debentures            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate   3.55%       3.55%
Repayment of long-term debt   $ 320        
4.15% debentures due December 15, 2031            
Disclosure of detailed information about borrowings [line items]            
Borrowings   $ 500        
Borrowings, interest rate   4.15%   4.15% 4.15% 4.15%
3.90% due on February 2025            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate       3.90% 3.90%  
Repayment of long-term debt $ 600          
2.05% due on July 2025            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate       2.05% 2.05%  
Repayment of long-term debt $ 600          
Long-Term Borrowings Expiring September 2027            
Disclosure of detailed information about borrowings [line items]            
Base shell prospectus borrowings, authorized         $ 4,500  
5.00% due on December 2029            
Disclosure of detailed information about borrowings [line items]            
Borrowings         $ 747 $ 750
Borrowings, interest rate   5.00%   5.00% 5.00% 5.00%
5.40% due on December 2034            
Disclosure of detailed information about borrowings [line items]            
Borrowings   $ 1,080   $ 1,029 $ 750 $ 750
Borrowings, interest rate   5.40%   5.40% 5.40% 5.40%
Long Term Borrowings, US Dollar Debt Securities            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate   3.80%       3.80%
Repayment of long-term debt     $ 500