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financial instruments - Contract assets (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | --- | --- | ---
Credit risk |  |  |  |
Contract assets | $ 1,475 | $ 1,303 | $ 1,303 | $ 1,205
Cost/Gross amount |  |  |  |
Credit risk |  |  |  |
Contract assets | 1,549 |  | 1,376 | 1,275
Allowance for doubtful accounts |  |  |  |
Credit risk |  |  |  |
Contract assets | (74) |  | (73) | (70)
The twelve month period ending one year hence |  |  |  |
Credit risk |  |  |  |
Contract assets | 1,017 |  | 907 | 853
The twelve month period ending one year hence | Cost/Gross amount |  |  |  |
Credit risk |  |  |  |
Contract assets | 1,068 |  | 958 | 901
The twelve month period ending one year hence | Allowance for doubtful accounts |  |  |  |
Credit risk |  |  |  |
Contract assets | (51) |  | (51) | (48)
The twelve month period ending two years hence |  |  |  |
Credit risk |  |  |  |
Contract assets | 444 |  | 385 | 338
The twelve month period ending two years hence | Cost/Gross amount |  |  |  |
Credit risk |  |  |  |
Contract assets | 466 |  | 407 | 359
The twelve month period ending two years hence | Allowance for doubtful accounts |  |  |  |
Credit risk |  |  |  |
Contract assets | (22) |  | (22) | (21)
Thereafter |  |  |  |
Credit risk |  |  |  |
Contract assets | 14 |  | 11 | 14
Thereafter | Cost/Gross amount |  |  |  |
Credit risk |  |  |  |
Contract assets | 15 |  | $ 11 | 15
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 2018-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 116 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_116_a&doctype=Standard -URIDate 2018-03-16 + Details
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