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Debt - Components (Detail) $ in Millions, $ in Millions	Mar. 31, 2021 USD ($)	Mar. 31, 2021 CAD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CAD ($)
Debt
Debt	$ 13,488		$ 13,810
Debt issuance costs, discounts and other	(83)		(85)
Current portion of long-term debt	244		551
Long-term debt, less current portion	13,244		13,259
Commercial Paper Program [Member]
Debt
Debt	1,534		$ 1,814
Current portion of long-term debt	$ 1,500
Weighted average interest rate	0.40%	0.40%	0.40%	0.40%
Senior Notes, Aggregate [Member]
Debt
Debt	$ 8,465		$ 8,465
Weighted average interest rate	3.30%	3.30%	3.30%	3.30%
Canadian Senior Notes [Member]
Debt
Debt	$ 398	$ 500	$ 393	$ 500
Interest rate (as a percent)	2.60%	2.60%	2.60%	2.60%
Tax Exempt Bonds [Member]
Debt
Debt	$ 2,547		$ 2,571
Current portion of long-term debt	$ 103
Weighted average interest rate	1.70%	1.70%	1.70%	1.70%
Financing leases and other [Member]
Debt
Debt	$ 627		$ 652
Current portion of long-term debt	$ 213
Weighted average interest rate	4.60%	4.60%	4.60%	4.60%
Minimum [Member] | Senior Notes, Aggregate [Member]
Debt
Interest rate (as a percent)	0.75%	0.75%	0.75%	0.75%
Minimum [Member] | Tax Exempt Bonds [Member]
Debt
Interest rate (as a percent)	0.10%	0.10%	0.10%	0.10%
Maximum [Member] | Senior Notes, Aggregate [Member]
Debt
Interest rate (as a percent)	7.75%	7.75%	7.75%	7.75%
Maximum [Member] | Tax Exempt Bonds [Member]
Debt
Interest rate (as a percent)	4.30%	4.30%	4.30%	4.30%

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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- Definition

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

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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- Definition

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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