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Debt - Borrowings and Repayments (Detail) CAD in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2017 USD ($) | Mar. 31, 2016 CAD | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Aug. 31, 2017 USD ($)
Debt |  |  |  |  |  |  |  |  |
Net commercial paper borrowings |  |  |  |  |  | $ 513 |  |  |
Debt repayments |  |  |  |  |  | 1,907 | $ 2,682 | $ 2,764 |
Loss on early extinguishment of debt |  |  |  |  |  | (6) | (4) | (555) |
Debt and capital lease principal payments in 2018 |  |  |  | $ 737 |  | 737 |  |  |
Debt and capital lease principal payments in 2019 |  |  |  | 302 |  | 302 |  |  |
Debt and capital lease principal payments in 2020 |  |  |  | 754 |  | 754 |  |  |
Debt and capital lease principal payments in 2021 |  |  |  | 549 |  | 549 |  |  |
Debt and capital lease principal payments in 2022 |  |  |  | 592 |  | 592 |  |  |
Debt and capital lease principal payments after 2022 |  |  |  | 6,667 |  | 6,667 |  |  |
Commercial Paper Program [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Net commercial paper borrowings |  |  |  |  |  | 513 |  |  |
Capital Leases and Other [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  | 87 |  | 87 |  |  |
Net debt borrowings (repayments) |  |  |  |  |  | (68) |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Net line of credit proceeds (repayments) |  |  |  |  |  | (703) |  |  |
Remaining increase in borrowings |  |  |  |  |  | 277 |  |  |
Canadian Term Loan [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Debt repayments |  |  |  |  | CAD 179 | 137 |  |  |
Senior Notes, Aggregate [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  | (552) |
Early extinguishment of high-coupon senior notes |  |  |  |  |  |  |  | $ 2,000 |
Senior Notes, 3.15 Percent, Due November 2027 [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 750 |  |  |  |  |  |  |  |
Net proceeds from issuance of senior notes | $ 745 |  |  |  |  |  |  |  |
Interest rate | 3.15% |  |  |  |  |  |  |  |
Senior Notes, 6.1 Percent, Due March 2018 [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Debt repayments | $ 590 |  |  |  |  |  |  |  |
Interest rate | 6.10% |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  | (6) |  | (6) |  |  |
Tax Exempt Bonds [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Debt repayments |  |  |  |  |  | 127 |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  | $ 175
Debt refunded and reissued |  |  |  | $ 124 |  | $ 124 |  |  |
Minimum [Member] | Senior Notes, Aggregate [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 2.40% |  | 2.40% |  |  |
Minimum [Member] | Tax Exempt Bonds [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 1.20% |  | 1.20% |  |  |
Maximum [Member] | Capital Leases and Other [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 12.00% |  | 12.00% |  |  |
Maximum [Member] | Senior Notes, Aggregate [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 7.75% |  | 7.75% |  |  |
Maximum [Member] | Tax Exempt Bonds [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 5.70% |  | 5.70% |  |  |
Canadian Subsidiaries [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Repayments of intercompany debt | CAD |  | CAD 370 |  |  |  |  |  |  |
Cash Flow Hedging [Member] | Foreign Currency Derivatives [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Cash received derivative termination |  |  | $ 67 |  |  |  |  |  |
Derivative termination expense |  |  |  |  |  |  | $ 8 |  |

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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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