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REVENUE - Contract Assets, Contract Liabilities, Deferred Commission Cost Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Balance, beginning of year $ 204 $ 621
Additions from new contracts with customers, net of terminations and renewals / Additions to deferred commission cost assets 121 121
Amortization of contract assets to accounts receivable / Amortization recognized on deferred commission cost assets (128) (538)
Balance, end of year 197 204
Balance, beginning of year 446 405
Revenue deferred in previous year and recognized as revenue in current year (397) (393)
Net additions from contracts with customers 412 434
Balance, end of year 461 446
Contract assets 86 89
Contract liabilities 61 52
Current portion of contract assets 111 115
Deferred commission costs assets    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Balance, beginning of year 312 262
Additions from new contracts with customers, net of terminations and renewals / Additions to deferred commission cost assets 363 315
Amortization of contract assets to accounts receivable / Amortization recognized on deferred commission cost assets (301) (265)
Balance, end of year 374 312
Contract assets 109 93
Current portion of contract assets $ 265 $ 219