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REVENUE - Contract Assets, Contract Liabilities, Deferred Commission Cost Assets (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Balance, beginning of year $ 621 $ 1,791
Additions from new contracts with customers, net of terminations and renewals / Additions to deferred commission cost assets 121 104
Amortization of contract assets to accounts receivable / Amortization recognized on deferred commission cost assets (538) (1,274)
Balance, end of year 204 621
Balance, beginning of year 405 224
Revenue deferred in previous year and recognized as revenue in current year (393) (184)
Net additions from contracts with customers 434 365
Balance, end of year 446 405
Contract assets 89 88
Contract liabilities 52 69
Current portion of contract assets 115 533
Deferred commission costs assets    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Balance, beginning of year 262 305
Additions from new contracts with customers, net of terminations and renewals / Additions to deferred commission cost assets 315 248
Amortization of contract assets to accounts receivable / Amortization recognized on deferred commission cost assets (265) (291)
Balance, end of year 312 262
Contract assets 93 68
Current portion of contract assets $ 219 $ 194