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Debt - Components (Detail) $ in Millions, $ in Millions	Dec. 31, 2022 USD ($)	Dec. 31, 2022 CAD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 CAD ($)
Debt
Debt	$ 14,984		$ 13,405
Debt issuance costs, discounts and other	(88)		(80)
Current portion of long-term debt	414		708
Long-term debt, less current portion	14,570		12,697
Commercial Paper Program [Member]
Debt
Debt	$ 1,730		$ 1,778
Weighted average interest rate	4.90%	4.90%	0.40%	0.40%
Term Loan maturing May 2024 [Member]
Debt
Debt	$ 1,000
Effective interest rate (as a percent)	5.10%	5.10%
Senior Notes, Aggregate [Member]
Debt
Debt	$ 8,626		$ 8,126
Weighted average interest rate	3.20%	3.20%	3.10%	3.10%
Senior Notes, Aggregate [Member] | Minimum [Member]
Debt
Interest rate (as a percent)	0.75%	0.75%
Senior Notes, Aggregate [Member] | Maximum [Member]
Debt
Interest rate (as a percent)	7.75%	7.75%
Canadian Senior Notes [Member]
Debt
Debt	$ 369	$ 500	$ 395	$ 500
Interest rate (as a percent)	2.60%	2.60%	2.60%	2.60%
Tax Exempt Bonds [Member]
Debt
Debt	$ 2,648		$ 2,619
Weighted average interest rate	2.70%	2.70%	1.40%	1.40%
Tax Exempt Bonds [Member] | Minimum [Member]
Debt
Interest rate (as a percent)	0.40%	0.40%
Tax Exempt Bonds [Member] | Maximum [Member]
Debt
Interest rate (as a percent)	4.40%	4.40%
Financing leases and other [Member]
Debt
Debt	$ 699		$ 567
Weighted average interest rate	4.70%	4.70%	4.50%	4.50%

X

- Definition

Amount of short-term and long-term debt and lease obligation.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Weighted average interest rate of debt outstanding.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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