STOCK OPTION AND STOCK UNIT PLANS (Tables)

12 Months Ended

Dec. 31, 2017



December 31, 2017	Number		Weighted Average Exercise Price	Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
(options in thousands; intrinsic value in millions of Canadian dollars)
Options outstanding at beginning of year	32,909		42.51
Options granted	5,995		55.72
Options exercised¹	(3,350	)	32.65
Options cancelled or expired	(1,188	)	53.23
Options outstanding at end of year	34,366		45.41	6.1	271
Options vested at end of year²	20,403		40.89	4.7	228


1	The total intrinsic value of ISOs exercised during the years ended December 31, 2017, 2016 and 2015 was $62 million, $123 million and $126 million, respectively, and cash received on exercise was $17 million, $37 million and $43 million, respectively.


2	The total fair value of ISOs vested during the years ended December 31, 2017, 2016 and 2015 was $44 million, $36 million and $34 million, respectively.

Schedule of weighted average assumptions used to determine the fair value of stock options granted

Weighted average assumptions used to determine the fair value of ISOs granted using the Black-Scholes-Merton option pricing model are as follows:



Year ended December 31,	2017		2016		2015
Fair value per option (Canadian dollars)¹	6.00		7.37		6.48
Valuation assumptions
Expected option term (years)²	5		5		5
Expected volatility³	20.4	%	25.1	%	19.9	%
Expected dividend yield⁴	4.2	%	4.4	%	3.2	%
Risk-free interest rate⁵	1.2	%	0.8	%	0.9	%

Options granted to United States employees are based on NYSE prices. The option value and assumptions shown are based on a weighted average of the United States and the Canadian options. The fair values per option for the years ended December 31, 2017, 2016 and 2015 were $5.66, $7.01 and $6.22, respectively, for Canadian employees and US$5.72, US$6.60 and US$6.16, respectively, for United States employees.


2	The expected option term is six years based on historical exercise practice and three years for retirement eligible employees.


3	Expected volatility is determined with reference to historic daily share price volatility and consideration of the implied volatility observable in call option values near the grant date.


4	The expected dividend yield is the current annual dividend at the grant date divided by the current stock price.


5	The risk-free interest rate is based on the Government of Canada’s Canadian Bond Yields and the United States Treasury Bond Yields.

Restricted Stock Units (RSU)

STOCK OPTION AND STOCK UNIT PLANS

Schedule of outstanding stock units



December 31, 2017	Number		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
(units in thousands; intrinsic value in millions of Canadian dollars)
Units outstanding at beginning of year	1,854
Units granted	741
Units cancelled	(186	)
Units matured¹	(839	)
Dividend reinvestment	123
Units outstanding at end of year	1,693		1.4	83


1	The total amount paid during the years ended December 31, 2017, 2016 and 2015 for RSUs was $39 million, $56 million and $45 million, respectively.