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Debt and Derivatives - Components (Detail)
$ in Millions, $ in Millions
Sep. 30, 2024
USD ($)
Sep. 30, 2024
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CAD ($)
Debt        
Debt $ 16,653   $ 16,229  
Debt issuance costs, discounts and other (125)   (123)  
Current portion of long-term debt 676   334  
Long-term debt, less current portion 15,977   15,895  
Commercial Paper Program [Member]        
Debt        
Debt     $ 860  
Weighted average interest rate     5.60% 5.60%
Senior Notes, Aggregate [Member]        
Debt        
Debt $ 12,720   $ 11,376  
Weighted average interest rate 3.90% 3.90% 3.70% 3.70%
Senior Notes, Aggregate [Member] | Minimum [Member]        
Debt        
Interest rate (as a percent) 0.75% 0.75% 0.75% 0.75%
Senior Notes, Aggregate [Member] | Maximum [Member]        
Debt        
Interest rate (as a percent) 7.75% 7.75% 7.75% 7.75%
Canadian Senior Notes [Member]        
Debt        
Debt $ 370 $ 500 $ 378 $ 500
Interest rate (as a percent) 2.60% 2.60% 2.60% 2.60%
Tax Exempt Bonds [Member]        
Debt        
Debt $ 2,823   $ 2,883  
Weighted average interest rate 3.70% 3.70% 3.30% 3.30%
Tax Exempt Bonds [Member] | Minimum [Member]        
Debt        
Interest rate (as a percent) 0.70% 0.70% 0.70% 0.70%
Tax Exempt Bonds [Member] | Maximum [Member]        
Debt        
Interest rate (as a percent) 5.00% 5.00% 5.00% 5.00%
Financing leases and other [Member]        
Debt        
Debt $ 865   $ 855  
Weighted average interest rate 4.90% 4.90% 5.00% 5.00%