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INVESTMENTS - Narrative (Details) - CAD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Interests in Other Entities [Abstract]
Realized losses	$ 0	$ 0
Unrealized gains (losses)	$ 780,000,000	$ (414,000,000)
Maple Leaf Sports and Entertainment Limited (MLSE)
Disclosure of joint ventures [line items]
Proportion of ownership interest	37.50%
Glentel
Disclosure of joint ventures [line items]
Proportion of ownership interest	50.00%
Parent Company and BCE, Inc. | Maple Leaf Sports and Entertainment Limited (MLSE)
Disclosure of joint ventures [line items]
Proportion of ownership interest	75.00%
BCE Inc. | Glentel
Disclosure of joint ventures [line items]
Proportion of ownership interest	50.00%

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The gains (losses) on available-for-sale financial assets. [Refer: Financial assets available-for-sale]

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Interests in Other Entities [Abstract]

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