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Debt - Components (Detail)
$ in Millions, $ in Millions
Jun. 30, 2024
USD ($)
Jun. 30, 2024
CAD ($)
Dec. 31, 2023
USD ($)
Debt      
Debt $ 16,743   $ 16,229
Debt issuance costs, discounts and other (117)   (123)
Current portion of long-term debt 242   334
Long-term debt, less current portion 16,501   15,895
Commercial Paper Program [Member]      
Debt      
Debt $ 1,565   $ 860
Weighted average interest rate 5.50% 5.50% 5.60%
Senior Notes, Aggregate [Member]      
Debt      
Debt $ 11,220   $ 11,376
Weighted average interest rate 3.70% 3.70% 3.70%
Senior Notes, Aggregate [Member] | Minimum [Member]      
Debt      
Interest rate (as a percent) 0.75% 0.75% 0.75%
Senior Notes, Aggregate [Member] | Maximum [Member]      
Debt      
Interest rate (as a percent) 7.75% 7.75% 7.75%
Canadian Senior Notes [Member]      
Debt      
Debt $ 366 $ 500 $ 378
Interest rate (as a percent) 2.60% 2.60% 2.60%
Tax Exempt Bonds [Member]      
Debt      
Debt $ 2,853   $ 2,883
Weighted average interest rate 3.30% 3.30% 3.30%
Tax Exempt Bonds [Member] | Minimum [Member]      
Debt      
Interest rate (as a percent) 0.55% 0.55% 0.55%
Tax Exempt Bonds [Member] | Maximum [Member]      
Debt      
Interest rate (as a percent) 5.00% 5.00% 5.00%
Financing leases and other [Member]      
Debt      
Debt $ 856   $ 855
Weighted average interest rate 5.00% 5.00% 5.00%