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REVENUE - Contract Assets, Contract Liabilities, Deferred Commission Cost Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items] |  |
Balance, beginning of year | $ 1,791 | $ 1,587
Additions from new contracts with customers, net of terminations and renewals / Additions to deferred commission cost assets | 104 | 1,653
Amortization of contract assets to accounts receivable / Amortization recognized on deferred commission cost assets | (1,274) | (1,449)
Balance, end of year | 621 | 1,791
Balance, beginning of year | 224 | 233
Revenue deferred in previous year and recognized as revenue in current year | (184) | (222)
Net additions from contracts with customers | 365 | 213
Balance, end of year | 405 | 224
Deferred commission costs assets |  |
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items] |  |
Balance, beginning of year | 305 | 296
Additions from new contracts with customers, net of terminations and renewals / Additions to deferred commission cost assets | 248 | 329
Amortization of contract assets to accounts receivable / Amortization recognized on deferred commission cost assets | (291) | (320)
Balance, end of year | $ 262 | $ 305

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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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- Definition The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer. + 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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- Definition The decrease in contract liabilities resulting from the performance obligation being satisfied. [Refer: Contract liabilities; Performance obligations [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_118_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The increase (decrease) in contract assets resulting from cumulative catch-up adjustments to revenue arising from a change in the measure of progress. [Refer: Increase (decrease) through cumulative catch-up adjustments to revenue, contract assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_118_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in contract assets resulting from cumulative catch-up adjustments to revenue arising from a contract modification. A contract modification is a change in the scope or price (or both) of a contract that is approved by the parties to the contract. [Refer: Increase (decrease) through cumulative catch-up adjustments to revenue, contract assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_118_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in contract liabilities resulting from cumulative catch-up adjustments to revenue. [Refer: Contract liabilities; Revenue from contracts with customers] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_118_b&doctype=Standard -URIDate 2020-01-01 + Details
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