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Debt and Derivatives - Components (Detail)
$ in Millions, $ in Millions
Jun. 30, 2023
USD ($)
Jun. 30, 2023
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CAD ($)
Debt        
Debt $ 15,368   $ 14,984  
Debt issuance costs, discounts and other (91)   (88)  
Current portion of long-term debt 513   414  
Long-term debt, less current portion 14,855   14,570  
Commercial Paper Program [Member]        
Debt        
Debt $ 1,345   $ 1,730  
Weighted average interest rate 5.40% 5.40% 4.90% 4.90%
Senior Notes, Aggregate [Member]        
Debt        
Debt $ 9,376   $ 8,626  
Weighted average interest rate 3.50% 3.50% 3.20% 3.20%
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%
Term Loan maturing May 2024 [Member]        
Debt        
Debt $ 1,000   $ 1,000  
Effective interest rate (as a percent) 5.90% 5.90% 5.10% 5.10%
Canadian Senior Notes [Member]        
Debt        
Debt $ 378 $ 500 $ 369 $ 500
Interest rate (as a percent) 2.60% 2.60% 2.60% 2.60%
Tax Exempt Bonds [Member]        
Debt        
Debt $ 2,658   $ 2,648  
Weighted average interest rate 2.90% 2.90% 2.70% 2.70%
Tax Exempt Bonds [Member] | Minimum [Member]        
Debt        
Interest rate (as a percent) 0.40% 0.40% 0.40% 0.40%
Tax Exempt Bonds [Member] | Maximum [Member]        
Debt        
Interest rate (as a percent) 4.40% 4.40% 4.40% 4.40%
Financing leases and other [Member]        
Debt        
Debt $ 702   $ 699  
Weighted average interest rate 4.80% 4.80% 4.70% 4.70%