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Debt and Interest Rate Derivatives - Components of Debt (Detail) $ in Millions, $ in Millions | Mar. 31, 2020 CAD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | ---
Debt |  |  |  |
Debt |  | $ 13,452 |  | $ 13,498
Debt issuance costs, discounts and other |  | (81) |  | (85)
Current portion of long-term debt |  | 387 |  | 218
Long-term debt, less current portion |  | 13,065 |  | 13,280
Senior Notes, Aggregate [Member] |  |  |  |
Debt |  |  |  |
Debt |  | $ 9,965 |  | $ 9,965
Weighted average interest rate | 3.90% | 3.90% | 3.90% | 3.90%
Canadian Senior Notes [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 500 | $ 355 | $ 500 | $ 385
Interest rate (as a percent) | 2.60% | 2.60% | 2.60% | 2.60%
Tax Exempt Bonds [Member] |  |  |  |
Debt |  |  |  |
Debt |  | $ 2,523 |  | $ 2,523
Current portion of long-term debt |  | $ 130 |  |
Weighted average interest rate | 2.70% | 2.70% | 2.30% | 2.30%
Financing leases and other [Member] |  |  |  |
Debt |  |  |  |
Debt |  | $ 690 |  | $ 710
Current portion of long-term debt |  | $ 237 |  |
Weighted average interest rate | 4.70% | 4.70% |  |
Minimum [Member] | Senior Notes, Aggregate [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 2.40% | 2.40% | 2.40% | 2.40%
Minimum [Member] | Tax Exempt Bonds [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 1.10% | 1.10% |  |
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) | 5.50% | 5.50% |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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