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Significant partly-owned subsidiary - Summarized Statements of Financial Position (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [line items]    
Current assets $ 5,688 $ 5,520
Non-current assets 54,977 54,626
Total assets 60,665 60,146
Current liabilities 8,271 9,777
Non-current liabilities 31,065 28,961
Total liabilities 39,336 38,738
Total equity attributable to BCE shareholders 20,989 21,074
NCI 340 334
CTV Specialty hedge    
Disclosure of subsidiaries [line items]    
Current assets 357 314
Non-current assets 1,032 994
Total assets 1,389 1,308
Current liabilities 159 151
Non-current liabilities 227 192
Total liabilities 386 343
Total equity attributable to BCE shareholders 699 671
NCI $ 304 $ 294
Proportion of ownership interests held by non-controlling interests 29.90% 29.90%
Net assets $ 6 $ 8