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Stock-Based Compensation - Stock Option Plan (Detail)
CAD / shares in Units, CAD in Millions
12 Months Ended
Dec. 31, 2015
CAD
CAD / shares
shares
Number of options, Options outstanding and Nonvested options  
Outstanding, January 1, 2015 | shares 2,738,689
New options granted | shares 317,202
Exercised | shares (542,816)
Vested | shares 0
Forfeited | shares (101,963)
Expired | shares (3,139)
Outstanding at December 31, 2015 | shares 2,407,973
Vested or expected to vest at December 31, 2015 | shares 2,399,076
Exercisable at December 31, 2015 | shares 1,422,994
Weighted average exercise price, Options outstanding  
Outstanding, January 1, 2015 (in dollars per share) | CAD / shares CAD 94.35
New options granted (in dollars per share) | CAD / shares 230.91
Exercised (in dollars per share) | CAD / shares 77.19
Vested (in dollars per share) | CAD / shares 0.00
Forfeited (in dollars per share) | CAD / shares 171.34
Expired (in dollars per share) | CAD / shares 49.08
Outstanding at December 31, 2015 (in dollar per share) | CAD / shares 113.01
Vested or expected to vest at December 31, 2015 (in dollars per share) | CAD / shares 112.71
Exercisable at December 31, 2015 (in dollars per share) | CAD / shares CAD 80.55
Weighted average grant date fair value, Nonvested options  
Weighted average remaining term of vested or expected to vest options 5 years 2 months 12 days
Aggregate intrinsic value of vested or expected to vest options | CAD CAD 171
Nonvested Options [Member]  
Number of options, Options outstanding and Nonvested options  
Outstanding, January 1, 2015 | shares 1,423,962
New options granted | shares 317,202
Exercised | shares 0
Vested | shares (654,283)
Forfeited | shares (101,463)
Expired | shares (439)
Outstanding at December 31, 2015 | shares 984,979
Weighted average grant date fair value, Nonvested options  
Outstanding, January 1, 2015 (in dollars per share) | CAD / shares CAD 32.35
New options granted (in dollars per share) | CAD / shares 55.28
Exercised (in dollars per share) | CAD / shares 0.00
Vested (in dollars per share) | CAD / shares 26.69
Forfeited (in dollars per share) | CAD / shares 48.06
Expired (in dollars per share) | CAD / shares 26.02
Outstanding at December 31, 2015 (in dollars per share) | CAD / shares CAD 41.88