JOINT ARRANGEMENTS - Joint Ventures and Associates (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
JOINT ARRANGEMENTS
Net (loss) earnings	$ (4,319)	$ 2,899
Other comprehensive income	(218)	(225)
Total Comprehensive (Loss) Income	(4,537)	2,674
Joint ventures
JOINT ARRANGEMENTS
Net (loss) earnings	(10)	(7)
Total Comprehensive (Loss) Income	(10)	(7)
Carrying amount as at December 31	58	68
Associates
JOINT ARRANGEMENTS
Net (loss) earnings	9
Total Comprehensive (Loss) Income	9
Carrying amount as at December 31	$ 68	$ 76

The amount of change in equity resulting from transactions and other events, other than those changes resulting from transactions with owners in their capacity as owners.

The total of income less expenses from continuing and discontinued operations, excluding the components of other comprehensive income. [Refer: Other comprehensive income]

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