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revenue from contracts with customers - Contract assets (Details) - CAD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Contract assets |  |  |  |  |  |
Contract assets | $ 1,303 | $ 1,303 | $ 1,475 | $ 1,303 | $ 1,303 | $ 1,205
Contract assets at beginning of period | 1,303 |  |  |  |  |
Net additions arising from operations | 1,455 | 1,270 |  |  |  |
Amounts billed in period and thus reclassified to accounts receivable | (1,284) | (1,166) |  |  |  |
Change in impairment allowance, net | (1) | (3) |  |  |  |
Other | 2 | (3) |  |  |  |
Contract assets at end of period | 1,475 | 1,303 |  |  |  |
Gross contract assets |  |  | 1,017 |  | 907 |
Reclassification to contract liabilities of contracts with contract assets less than contract liabilities |  |  | (3) |  | (4) |
Reclassification from contract liabilities of contracts with contract liabilities less than contract assets |  |  | (154) |  | (146) |
Contract assets |  |  | 860 |  | 757 | 700
Wireless segment |  |  |  |  |  |
Contract assets |  |  |  |  |  |
Amounts billed in period and thus reclassified to accounts receivable | 1,180 | 1,060 |  |  |  |
As previously reported |  |  |  |  |  |
Contract assets |  |  |  |  |  |
Contract assets | 1,303 | 0 |  |  | 1,303 |
Contract assets at beginning of period | 1,303 | 0 |  |  |  |
Contract assets at end of period |  | 1,303 |  |  |  |
IFRS 15 effects |  |  |  |  |  |
Contract assets |  |  |  |  |  |
Contract assets |  |  |  |  |  | 1,205
Contract assets |  |  | 860 |  | 757 | 700
The twelve month period ending one year hence |  |  |  |  |  |
Contract assets |  |  |  |  |  |
Contract assets | 907 | 907 | 1,017 |  | 907 | 853
Contract assets at beginning of period | 907 |  |  |  |  |
Contract assets at end of period | 1,017 | 907 |  |  |  |
The twelve month period ending two years hence |  |  |  |  |  |
Contract assets |  |  |  |  |  |
Contract assets | 385 | 385 | 444 |  | 385 | 338
Contract assets at beginning of period | 385 |  |  |  |  |
Contract assets at end of period | 444 | 385 |  |  |  |
Thereafter |  |  |  |  |  |
Contract assets |  |  |  |  |  |
Contract assets | 11 | 11 | $ 14 |  | $ 11 | $ 14
Contract assets at beginning of period | 11 |  |  |  |  |
Contract assets at end of period | $ 14 | $ 11 |  |  |  |

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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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- References No definition available. + Details
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- Definition The amount of current contract assets. [Refer: Contract assets] + 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 + Details
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- Definition The amount of current contract assets before reclassifications into and out of contract liabilities. + References No definition available. + Details
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- Definition The decrease in contract assets resulting from reclassification to accounts receivable. + References No definition available. + Details
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- Definition The increase (decrease) in contract assets resulting from other activities. + References No definition available. + Details
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- Definition Increase (decrease) in impairment allowance for credit losses of financial assets. + References No definition available. + Details
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- Definition The increase in contract assets resulting from operational activities during the period. + References No definition available. + Details
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- Definition Reclassification from contract liabilities for contracts with contract liabilities less than contract assets. + References No definition available. + Details
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