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Debt - Components (Detail) $ in Millions, $ in Millions	Dec. 31, 2021 USD ($)	Dec. 31, 2021 CAD ($)	Dec. 31, 2020 USD ($)
Debt
Debt	$ 13,405		$ 13,810
Debt issuance costs, discounts and other	(80)		(85)
Current portion of long-term debt	708		551
Long-term debt, less current portion	12,697		13,259
Commercial Paper Program [Member]
Debt
Debt	1,778		$ 1,814
Current portion of long-term debt	$ 1,800
Weighted average interest rate	0.40%	0.40%	0.40%
Senior Notes, Aggregate [Member]
Debt
Debt	$ 8,126		$ 8,465
Weighted average interest rate	3.10%	3.10%	3.30%
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	$ 395	$ 500	$ 393
Interest rate (as a percent)	2.60%	2.60%
Tax Exempt Bonds [Member]
Debt
Debt	$ 2,619		$ 2,571
Current portion of long-term debt	$ 71
Weighted average interest rate	1.40%	1.40%	1.70%
Tax Exempt Bonds [Member] | Minimum [Member]
Debt
Interest rate (as a percent)	0.10%	0.10%
Tax Exempt Bonds [Member] | Maximum [Member]
Debt
Interest rate (as a percent)	4.30%	4.30%
Financing leases and other [Member]
Debt
Debt	$ 567		$ 652
Current portion of long-term debt	$ 170
Weighted average interest rate	4.50%	4.50%	4.60%

X

- Definition

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

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

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