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financial instruments - Contract assets (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Credit risk |  |  |
Contract assets | $ 850 | $ 1,238 | $ 1,475
Cost/Gross amount |  |  |
Credit risk |  |  |
Contract assets | 892 | 1,295 |
Allowance for doubtful accounts |  |  |
Credit risk |  |  |
Contract assets | (42) | (57) |
The 12-month period ending one year hence |  |  |
Credit risk |  |  |
Contract assets | 582 | 910 |
The 12-month period ending one year hence | Cost/Gross amount |  |  |
Credit risk |  |  |
Contract assets | 611 | 952 |
The 12-month period ending one year hence | Allowance for doubtful accounts |  |  |
Credit risk |  |  |
Contract assets | (29) | (42) |
The 12-month period ending two years hence |  |  |
Credit risk |  |  |
Contract assets | 253 | 308 |
The 12-month period ending two years hence | Cost/Gross amount |  |  |
Credit risk |  |  |
Contract assets | 265 | 322 |
The 12-month period ending two years hence | Allowance for doubtful accounts |  |  |
Credit risk |  |  |
Contract assets | (12) | (14) |
Thereafter |  |  |
Credit risk |  |  |
Contract assets | 15 | 20 |
Thereafter | Cost/Gross amount |  |  |
Credit risk |  |  |
Contract assets | 16 | 21 |
Thereafter | Allowance for doubtful accounts |  |  |
Credit risk |  |  |
Contract assets | $ (1) | $ (1) |

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- Definition The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_105&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 116 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_116_a&doctype=Standard -URIDate 2020-01-01 + Details
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