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Debt - Classification and Utilization (Detail) CAD in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2016 USD ($)
Debt |  |  |  |
Current portion of long-term debt |  | $ 739 |  | $ 417
Debt and capital lease obligations |  | 9,491 |  | 9,310
Carrying value of debt |  | 9,491 |  | 9,310
Commercial Paper Program [Member] |  |  |  |
Debt |  |  |  |
Current portion of long-term debt |  | 515 |  |
Maximum capacity |  | 1,500 |  |
Debt and capital lease obligations |  | 515 |  |
Debt term | 397 days |  |  |
Commercial paper, borrowings |  | 515 |  |
Carrying value of debt |  | 515 |  |
Tax Exempt Bonds [Member] |  |  |  |
Debt |  |  |  |
Current portion of long-term debt |  | 167 |  |
Debt with interest rate periods that expiring in the next 12 months |  | 831 |  |
Variable-rate tax-exempt bonds |  | 328 |  |
Debt and capital lease obligations |  | 2,352 |  | 2,304
Carrying value of debt |  | 2,352 |  | 2,304
Revolving Credit Facility [Member] |  |  |  |
Debt |  |  |  |
Letters of credit outstanding |  | 642 |  |
Maximum capacity |  | 2,250 |  | 2,250
Debt and capital lease obligations |  |  |  | 426
Unused and available credit capacity |  | 1,093 |  |
Outstanding borrowings under credit facility |  | 0 |  |
Carrying value of debt |  |  |  | 426
Canadian Term Loan and Revolving Credit Facility [Member] |  |  |  |
Debt |  |  |  |
Letters of credit outstanding | CAD | CAD 0 |  | CAD 0 |
Debt and capital lease obligations |  | 113 |  | 239
Outstanding borrowings under credit facility | CAD | 0 |  | 0 |
Carrying value of debt |  | 113 |  | 239
Canadian Revolving Credit Facility [Member] |  |  |  |
Debt |  |  |  |
Maximum capacity | CAD | 50 |  |  |
Canadian Term Loan [Member] |  |  |  |
Debt |  |  |  |
Debt and capital lease obligations | 142 | 113 | 321 | 239
Maximum term credit | CAD | 460 |  |  |
Carrying value of debt | CAD 142 | 113 | CAD 321 | 239
Other Letter of Credit Facilities [Member] |  |  |  |
Debt |  |  |  |
Letters of credit outstanding |  | 507 |  | 492
Capital Leases and Other [Member] |  |  |  |
Debt |  |  |  |
Debt and capital lease obligations |  | 327 |  | 308
Carrying value of debt |  | 327 |  | $ 308
Other Debt [Member] |  |  |  |
Debt |  |  |  |
Current portion of long-term debt |  | $ 224 |  |
London Interbank Offered Rate [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |
Debt |  |  |  |
Spread rate | 0.805% |  |  |
London Interbank Offered Rate [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |
Debt |  |  |  |
Spread rate | 1.30% |  |  |
London Interbank Offered Rate [Member] | Canadian Term Loan and Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |
Debt |  |  |  |
Spread rate | 0.875% |  |  |
London Interbank Offered Rate [Member] | Canadian Term Loan and Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |
Debt |  |  |  |
Spread rate | 1.50% |  |  |

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References No definition available. + Details
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- Definition Represent debt with interest rate periods that expire within the next 12 months. + References No definition available. + Details
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- Definition Maximum borrowing capacity under a term loan without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References No definition available. + Details
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