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SUPPLEMENTAL CASH FLOW INFORMATION - Changes in non-cash operating working capital items (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash Flow Statement [Abstract]
Accounts receivable, excluding financing receivables	$ 455	$ (174)
Financing receivables	(1,658)	(120)
Contract assets	1,170	(204)
Inventories	(19)	7
Other current assets	(132)	(41)
Accounts payable and accrued liabilities	(326)	61
Contract and other liabilities	177	9
Total change in net operating assets and liabilities	$ (333)	$ (462)

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- Definition

Adjustments for decrease (increase) in inventories to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Inventories; Profit (loss)]

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Adjustments for decrease (increase) in other current assets to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Other current assets; Profit (loss)]

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Adjustments for increase (decrease) in trade and other payables to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Trade and other payables; Profit (loss)]

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The increase (decrease) in working capital.

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Cash Flow Statement [Abstract]

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Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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