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Significant partly-owned subsidiaries - Summarized Statements of Financial Position (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [line items]    
Current assets $ 4,639 $ 4,855
Non-current assets 49,624 45,253
Total assets 54,263 50,108
Current liabilities 10,787 10,108
Non-current liabilities 23,993 22,146
Total liabilities 34,780 32,254
Total equity attributable to BCE shareholders 19,160 17,540
Non-controlling interest 323 314
CTV Specialty hedge    
Disclosure of subsidiaries [line items]    
Current assets 328 293
Non-current assets 1,013 1,013
Total assets 1,341 1,306
Current liabilities 153 130
Non-current liabilities 184 195
Total liabilities 337 325
Total equity attributable to BCE shareholders 700 687
Non-controlling interest $ 304 $ 294
Proportion of ownership interests held by non-controlling interests 29.90% 29.90%
Net assets $ 6 $ 2