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Debt - Classification and Utilization (Detail) $ in Millions, $ in Millions | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 CAD ($) item | Sep. 30, 2018 USD ($) item | Jul. 31, 2018 CAD ($) | May 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt |  |  |  |  |  |
Debt maturing or subject to remarketing within twelve months |  | $ 2,200 |  |  |  |
Current portion of long-term debt |  | 447 |  |  |  | $ 739
Commercial Paper Program [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt maturing or subject to remarketing within twelve months classified as long-term |  | 955 |  |  |  |
Maximum capacity |  | 2,750 |  |  | $ 1,500 |
Debt, before unamortized (discount) premium |  | 1,100 |  |  |  |
Debt term | 397 days |  |  |  |  |
Tax Exempt Bonds [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt with interest rate periods that expire in the next 12 months |  | 806 |  |  |  |
Current portion of long-term debt |  | 209 |  |  |  |
Debt maturing or subject to remarketing within twelve months classified as long-term |  | 761 |  |  |  |
Variable-rate tax-exempt bonds |  | 268 |  |  |  |
Canadian Revolving Credit Facility [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Maximum capacity |  |  | $ 50 |  |  |
Canadian Term Loan [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Maximum term credit |  |  | $ 460 |  |  |
Other Letter of Credit Facilities [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Letters of credit outstanding |  | 541 |  |  |  |
Capital Leases and Other [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Current portion of long-term debt |  | 260 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Maximum capacity |  | 2,750 |  | $ 2,250 |  |
Accordion option capacity |  | $ 750 |  |  |  |
Number of extension periods | item | 2 | 2 |  |  |  |
Extension term | 1 year |  |  |  |  |
Letters of credit outstanding |  | $ 606 |  |  |  |
Unused and available credit capacity |  | 1,000 |  |  |  |
Credit Facility Revolving, Canadian [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Maximum capacity |  | 375 |  |  |  |
Outstanding borrowings under credit facility | $ 57 | $ 44 |  |  |  |

X
- 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 Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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 Amount of short-term borrowings, long-term debt and capital leases due or subject to remarketing within the next twelve months, including amounts classified as current and amounts classified as noncurrent due to intent and ability to refinance. + References No definition available. + Details
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- Definition Amount of short-term borrowings, long-term debt and capital leases due or subject to remarketing within the next twelve months, including amounts classified as current and amounts classified as noncurrent due to intent and ability to refinance. + 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 Represents the period of time for the extension. + References No definition available. + Details
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- Definition The accordion option increase above the current maximum borrowing capacity under the credit facility. + References No definition available. + Details
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- Definition Represents the number of extension periods. + 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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