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REVENUE - Contract Assets, Contract Liabilities, Deferred Commission Cost Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
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