Consolidated statement of cash flows - CAD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net income (loss)		$ 392	$ (188)
Adjustments for non-cash items:
Depreciation and depletion		494	453
Impairment of intangible assets (note 11)		0	20
(Gain) loss on asset sales (note 3)		(3)	(7)
Inventory write-down to current market value (note 11)		0	281
Deferred income taxes and other		60	43
Changes in operating assets and liabilities:
Accounts receivable		(469)	1,143
Inventories, materials, supplies and prepaid expenses		(159)	(199)
Income taxes payable		21	(104)
Accounts payable and accrued liabilities		584	(1,028)
All other items - net	[1]	125	9
Cash flows from (used in) operating activities		1,045	423
Investing activities
Additions to property, plant and equipment		(167)	(310)
Proceeds from asset sales (note 3)		7	9
Loans to equity companies - net		13	(7)
Cash flows from (used in) investing activities		(147)	(308)
Financing activities
Short-term debt - net		(36)	0
Reduction in finance lease obligations (note 6)		(4)	(7)
Dividends paid		(162)	(164)
Common shares purchased (note 9)		0	(274)
Cash flows from (used in) financing activities		(202)	(445)
Increase (decrease) in cash		696	(330)
Cash at beginning of period		771	1,718
Cash at end of period	[2]	$ 1,467	$ 1,388

[1]  Included contributions to registered pension plans. (28) (59)

[2] Cash is composed of cash in bank and cash equivalents at cost. Cash equivalents are all highly liquid securities with maturity of three months or less when purchased.