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REVENUE - Contract Assets, Contract Liabilities, Deferred Commission Cost Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Balance, beginning of year $ 1,233 $ 1,077
Additions from new contracts with customers, net of terminations and renewals 1,572 1,196
Amortization of contract assets to accounts receivable (1,218) (1,040)
Balance, end of year 1,587 1,233
Balance, beginning of year 278 302
Revenue deferred in previous year and recognized as revenue in current year (268) (284)
Net additions from contracts with customers 223 260
Balance, end of year 233 278
Deferred commission costs assets    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Balance, beginning of year 278 260
Additions from new contracts with customers, net of terminations and renewals 340 310
Amortization of contract assets to accounts receivable (322) (292)
Balance, end of year $ 296 $ 278