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v3.10.0.1

other operating income (Details) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD ($)
other operating income |  |  |  |  |
Government assistance, including deferral account amortization |  |  | $ 23 |  | $ 32
Investment income, gain (loss) on disposal of assets and other |  |  | 230 |  | 45
Change in business combination-related accrued receivable and provisions |  |  | 17 |  | 26
Interest income |  |  | 3 |  |
Total |  |  | $ 273 |  | $ 103
Subsidy receipts |  | $ 18 |  | $ 19 |
Contribution expense rate |  | 0.54% | 0.54% |  |
Interim contribution expense rate | 0.60% |  |  |  |
Quebec employment positions tax credit |  | $ 4 |  | $ 7 |

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- Definition The amount of revenue arising from sources that the entity does not separately disclose in the same statement or note. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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