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REVENUE - Contract Assets, Contract Liabilities, Deferred Commission Cost Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Balance, beginning of year $ 1,587 $ 1,233
Additions from new contracts with customers, net of terminations and renewals / Additions to deferred commission cost assets 1,653 1,572
Amortization of contract assets to accounts receivable / Amortization recognized on deferred commission cost assets (1,449) (1,218)
Balance, end of year 1,791 1,587
Balance, beginning of year 233 278
Revenue deferred in previous year and recognized as revenue in current year (222) (268)
Net additions from contracts with customers 213 223
Balance, end of year 224 233
Deferred commission costs assets    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Balance, beginning of year 296 278
Additions from new contracts with customers, net of terminations and renewals / Additions to deferred commission cost assets 329 340
Amortization of contract assets to accounts receivable / Amortization recognized on deferred commission cost assets (320) (322)
Balance, end of year $ 305 $ 296