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Debt - Borrowings and Repayments (Detail) $ in Millions, $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 CAD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Debt |  |  |
Net commercial paper borrowings |  | $ 443 | $ 253
Debt repayments |  | 196 | 627
New borrowings |  | 83 | $ 86
Revolving Credit Facility [Member] |  |  |
Debt |  |  |
Net line of credit proceeds (repayments) |  | 28 |
Commercial Paper Program [Member] |  |  |
Debt |  |  |
Net line of credit proceeds (repayments) |  | 443 |
Canadian Term Loan [Member] |  |  |
Debt |  |  |
Debt repayments | $ 48 | 37 |
Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Debt repayments |  | 42 |
Capital Leases and Other [Member] |  |  |
Debt |  |  |
Net debt borrowings (repayments) |  | $ 67 |
Minimum [Member] | Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Interest rate | 1.35% | 1.35% |
Maximum [Member] | Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Interest rate | 5.70% | 5.70% |
Maximum [Member] | Capital Leases and Other [Member] |  |  |
Debt |  |  |
Interest rate | 12.00% | 12.00% |

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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow associated with security instrument that either represents a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes proceeds from (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The net cash inflow or cash outflow from issuing (borrowing) and repaying commercial paper. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- Definition The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- Definition The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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