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v3.20.1

Debt and Interest Rate Derivatives - Debt classification and Utilization (Detail) $ in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 CAD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt |  |  |
Debt maturing or subject to remarketing within twelve months |  | $ 1,900 |
Current portion of long-term debt |  | 387 | $ 218
4.75% senior notes due June 2020 [Member] |  |  |
Debt |  |  |
Debt instrument face amount |  | $ 600 |
Interest rate (as a percent) | 4.75% | 4.75% |
4.60% senior notes due March 2021 [Member] |  |  |
Debt |  |  |
Debt instrument face amount | $ 400 |  |
Interest rate (as a percent) | 4.60% | 4.60% |
Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Debt with interest rate periods that expire in the next 12 months |  | $ 639 |
Current portion of long-term debt |  | 130 |
Debt maturing or subject to remarketing within twelve months classified as long-term |  | 1,500 |
Variable-rate tax-exempt bonds |  | 169 |
Variable-rate tax-exempt bonds, current |  | 33 |
Variable-rate tax-exempt bonds, non-current |  | $ 136 |
Tax Exempt Bonds [Member] | Minimum [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 1.10% | 1.10% |
Tax Exempt Bonds [Member] | Maximum [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 5.50% | 5.50% |
Financing leases and other [Member] |  |  |
Debt |  |  |
Current portion of long-term debt |  | $ 237 |
Revolving Credit Facility [Member] |  |  |
Debt |  |  |
Outstanding borrowings under credit facility |  | 0 |
Maximum capacity |  | 3,500 |
Letters of credit outstanding |  | 412 |
Unused and available credit capacity |  | 3,100 |
Commercial Paper Program [Member] |  |  |
Debt |  |  |
Commercial paper, borrowings |  | 0 |
Debt term | 397 days |  |
Other Letter Of Credit Facilities [Member] |  |  |
Debt |  |  |
Letters of credit outstanding |  | $ 525 |

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: 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(19)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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