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Earnings (Loss) Per Share - Calculation of Basic and Diluted Earnings Per Share (Details) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Earnings per share [line items]
Common shareholders' net income (loss) for basic earnings per share	$ 2,522	$ 2,149
Add: Increase in income due to convertible instruments	10	10
Common shareholders' net income (loss) on a diluted basis	$ 2,532	$ 2,159
Weighted average number of common shares outstanding for basic earnings per share (in shares)	606	613
Dilutive impact of stock options (in shares)	1	1
Dilutive impact of convertible instruments (in shares)	4	4
Weighted average number of common shares outstanding on a diluted basis (in shares)	611	618
Basic earnings (loss) per share (in CAD per share)	$ 4.16	$ 3.51
Diluted earnings (loss) per share (in CAD per share)	$ 4.14	$ 3.49
Stock Option
Earnings per share [line items]
Stock options excluded from computation of earnings per share (in shares)	1	0

X

- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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