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v3.19.1

Debt - Borrowings and Repayments (Detail) $ in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 CAD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($)
Debt |  |  |
Debt repayments |  | $ 56 | $ 80
Net commercial paper borrowings |  | 357 | $ 471
Revolving Credit Facility [Member] |  |  |
Debt |  |  |
Debt repayments | $ 15 | 11 |
Commercial Paper Program [Member] |  |  |
Debt |  |  |
Net commercial paper borrowings |  | 357 |
Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Debt repayments |  | 34 |
Financing leases and other debt [Member] |  |  |
Debt |  |  |
Debt repayments |  | 11 |
Non-cash financing lease incurred |  | $ 30 |

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- Definition The increase during the period in capital lease obligations due to entering into new capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + 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 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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