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Stock-based Compensation Plans - Stock Option Activity (Details) CAD / shares in Units, CAD in Millions	12 Months Ended
	Dec. 31, 2016 CAD CAD / shares shares
Total Options, Number of Options
Options outstanding, beginning balance (shares) | shares	4,416,454
Granted (shares) | shares	788,188
Awards paid out (shares) | shares	(1,041,450)
Cancelled/Forfeited (shares) | shares	(3,000)
Options outstanding, ending balance (shares) | shares	4,160,192
Options vested, number of options (shares) | shares	2,345,174
Total Options, Weighted Average Exercise Price
Options outstanding, beginning balance (cad per share) | CAD / shares	CAD 32.12
Granted (cad per share) | CAD / shares	37.30
Exercised (cad per share) | CAD / shares	26.74
Cancelled/Forfeited (cad per share) | CAD / shares	31.68
Options outstanding, ending balance (cad per share) | CAD / shares	34.45
Options vested, weighted average exercise price (cad per share) | CAD / shares	CAD 33.14
Non-vested Options, Number of Options
Options outstanding, beginning balance (shares) | shares	1,936,532
Granted (shares) | shares	788,188
Vested (shares) | shares	(906,702)
Cancelled/Forfeited (shares) | shares	(3,000)
Options outstanding, ending balance (shares) | shares	1,815,018
Non-vested Options, Weighted Average Grant Date Fair Value
Options outstanding, beginning balance (cad per share) | CAD / shares	CAD 3.30
Granted (cad per share) | CAD / shares	2.41
Vested (cad per share) | CAD / shares	3.57
Cancelled/Forfeited (cad per share) | CAD / shares	3.66
Options outstanding, ending balance (cad per share) | CAD / shares	CAD 2.78
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense | CAD	CAD 5
Weighted average remaining term of vested options	6 years
Aggregate intrinsic value | CAD	CAD 20
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining weighted average period to recognize compensation expense (years)	3 years

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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