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v3.22.1

Debt - Components (Detail) $ in Millions, $ in Millions | Mar. 31, 2022 USD ($) | Mar. 31, 2022 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CAD ($)
--- | --- | --- | --- | ---
Debt |  |  |  |
Debt | $ 13,487 |  | $ 13,405 |
Debt issuance costs, discounts and other | (78) |  | (80) |
Current portion of long-term debt | 435 |  | 708 |
Long-term debt, less current portion | 13,052 |  | 12,697 |
Commercial Paper Program [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 1,689 |  | $ 1,778 |
Weighted average interest rate | 0.50% | 0.50% | 0.40% | 0.40%
Senior Notes, Aggregate [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 8,126 |  | $ 8,126 |
Weighted average interest rate | 3.10% | 3.10% | 3.10% | 3.10%
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%
Canadian Senior Notes [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 400 | $ 500 | $ 395 | $ 500
Interest rate (as a percent) | 2.60% | 2.60% | 2.60% | 2.60%
Tax Exempt Bonds [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 2,619 |  | $ 2,619 |
Weighted average interest rate | 1.50% | 1.50% | 1.40% | 1.40%
Tax Exempt Bonds [Member] | Minimum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 0.30% | 0.30% | 0.30% | 0.30%
Tax Exempt Bonds [Member] | Maximum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 4.30% | 4.30% | 4.30% | 4.30%
Financing leases and other [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 731 |  | $ 567 |
Weighted average interest rate | 4.80% | 4.80% | 4.50% | 4.50%

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