Stock Plans (Tables)

12 Months Ended

Dec. 31, 2011

Notes To Financial Statements [Abstract]

Disclosures regarding the employee share investment plan

The following table provides the number of participants holding shares, the total number of ESIP shares purchased on behalf of employees, including the Company's contributions, as well as the resulting expense recorded for the years ended December 31, 2011, 2010 and 2009:

Year ended December 31,		2011		2010		2009
Number of participants holding shares		16,218		14,997		14,152
Total number of ESIP shares purchased on behalf of employees (millions)		1.3		1.3		1.6
Expense for Company contribution (millions)	$	21	$	19	$	18

Disclosures of share based compensation arrangements by share based payment award

The following table provides the total stock-based compensation expense for awards under all plans, as well as the related tax benefit recognized in income, for the years ended December 31, 2011, 2010 and 2009:

In millions	Year ended December 31,		2011		2010		2009

Cash settled awards
Restricted share unit plan		$	81	$	77	$	43
Voluntary Incentive Deferral Plan (VIDP)			21		18		33
			102		95		76

Stock option awards			10		9		14
Total stock-based compensation expense		$	112	$	104	$	90

Tax benefit recognized in income		$	24	$	27	$	26

The following table provides the 2011 activity for all cash settled awards:

	RSUs		VIDP
In millions	Nonvested	Vested	Nonvested	Vested
Outstanding at December 31, 2010	1.3	0.7	-	1.5
Granted (Payout)	0.5	(0.7)	-	(0.1)
Vested during year	(0.9)	0.9	-	-
Outstanding at December 31, 2011	0.9	0.9	-	1.4

		Options outstanding			Nonvested options
				Weighted-			Weighted-
		Number of	average		Number of	average grant
		of options	exercise price		options	date fair value
		In millions			In millions
Outstanding at December 31, 2010 ⁽¹⁾		8.9	$	34.23	2.3	$	12.80
Granted		0.6	$	68.94	0.6	$	15.66
Exercised		(2.6)	$	26.94	N/A		N/A
Vested		N/A		N/A	(0.9)	$	12.83
Outstanding at December 31, 2011 ⁽¹⁾		6.9	$	40.80	2.0	$	13.71
Exercisable at December 31, 2011 ⁽¹⁾		4.9	$	35.58	N/A		N/A

(1)	Stock options with a US dollar exercise price have been translated to Canadian dollars using the foreign exchange rate in effect at the balance sheet date.

The following table provides information related to stock options exercised during the years ended December 31, 2011, 2010 and 2009:

In millions	Year ended December 31,		2011		2010		2009
Total intrinsic value		$	122	$	125	$	93
Cash received upon exercise of options		$	68	$	87	$	53
Related excess tax benefit realized		$	9	$	28	$	20

Valuation and expense information for all cash settled awards

The following table provides valuation and expense information for all cash settled awards:

In millions, unless otherwise indicated		RSUs ⁽¹⁾																VIDP ⁽²⁾	Total

Year of grant		2011		2010		2009		2008		2007		2006

Stock-based compensation expense (recovery)
	recognized over requisite service period
Year ended December 31, 2011		$	19	$	27	$	35	$	-		N/A		N/A	$	21	$	102
Year ended December 31, 2010			N/A	$	17	$	34	$	26	$	-		N/A	$	18	$	95
Year ended December 31, 2009			N/A		N/A	$	13	$	3	$	29	$	(2)	$	33	$	76

Liability outstanding
December 31, 2011		$	19	$	44	$	82		N/A		N/A		N/A	$	119	$	264
December 31, 2010			N/A	$	17	$	46	$	37		N/A		N/A	$	99	$	199

Fair value per unit
December 31, 2011 ($)		$	60.48	$	77.59	$	80.15		N/A		N/A		N/A	$	80.15		N/A

Fair value of awards vested during the year
Year ended December 31, 2011		$	-	$	-	$	82		N/A		N/A		N/A	$	1	$	83
Year ended December 31, 2010			N/A	$	-	$	-	$	37		N/A		N/A	$	1	$	38
Year ended December 31, 2009			N/A		N/A	$	-	$	-	$	38		N/A	$	3	$	41

Nonvested awards at December 31, 2011
Unrecognized compensation cost		$	20	$	14	$	-		N/A		N/A		N/A	$	1	$	35
Remaining recognition period (years)			2.0		1.0		N/A		N/A		N/A		N/A		N/A⁽³⁾		N/A

Assumptions ⁽⁴⁾
Stock price ($)		$	80.15	$	80.15	$	80.15		N/A		N/A		N/A	$	80.15		N/A
Expected stock price volatility ⁽⁵⁾			18%		18%		N/A		N/A		N/A		N/A		N/A		N/A
Expected term (years) ⁽⁶⁾			2.0		1.0		N/A		N/A		N/A		N/A		N/A		N/A
Risk-free interest rate ⁽⁷⁾			0.95%		0.92%		N/A		N/A		N/A		N/A		N/A		N/A
Dividend rate ($) ⁽⁸⁾		$	1.30	$	1.30	$	N/A		N/A		N/A		N/A		N/A		N/A

(1)	Compensation cost is based on the fair value of the awards at period-end using the lattice-based valuation model that uses the assumptions as presented herein.
(2)	Compensation cost is based on intrinsic value.
(3)	The remaining recognition period has not been quantified as it relates solely to the 25% Company grant and the dividends earned thereon, representing a minimal number of units.
(4)	Assumptions used to determine fair value are at December 31, 2011.
(5)	Based on the historical volatility of the Company's stock over a period commensurate with the expected term of the award.
(6)	Represents the remaining period of time that awards are expected to be outstanding.
(7)	Based on the implied yield available on zero-coupon government issues with an equivalent term commensurate with the expected term of the awards.
(8)	Based on the annualized dividend rate.

Number of stock options outstanding and exercisable by range of exercise price and their related intrinsic value, and for options outstanding, the weighted-average years to expiration

The following table provides the number of stock options outstanding and exercisable as at December 31, 2011 by range of exercise price and their related intrinsic value, and for options outstanding, the weighted-average years to expiration. The table also provides the aggregate intrinsic value for in-the-money stock options, which represents the value that would have been received by option holders had they exercised their options on December 31, 2011 at the Company's closing stock price of $80.15.

					Options outstanding							Options exercisable
Range of exercise prices					Number of options	Weighted-average years to expiration	Weighted-average exercise price			Aggregate intrinsic value		Number of options	Weighted-average exercise price			Aggregate intrinsic value
					In millions				In millions			In millions			In millions

$	11.63	-	$	20.51	1.5	1.1	$	20.42		$	92	1.5	$	20.42		$	92
$	20.52	-	$	30.19	0.6	1.0	$	26.67			29	0.6	$	26.67			29
$	30.20	-	$	40.22	0.9	5.9	$	35.18			40	0.5	$	35.46			24
$	40.23	-	$	50.69	2.0	5.6	$	46.11			69	1.6	$	46.28			54
$	50.70	-	$	78.24	1.9	7.5	$	58.74			40	0.7	$	52.50			18
Balance at December 31, 2011 ⁽¹⁾					6.9	4.8	$	40.80		$	270	4.9	$	35.58		$	217

(1)	Stock options with a US dollar exercise price have been translated to Canadian dollars using the foreign exchange rate in effect at the balance sheet date. As at December 31, 2011, all stock options outstanding were in-the-money. The weighted-average years to expiration of exercisable stock options is 3.5 years.

Valuation and expense information for all stock option awards

The following table provides valuation and expense information for all stock option awards:

In millions, unless otherwise indicated
Year of grant			2011		2010		2009		2008		2007		2006		2005		Total

Stock-based compensation expense
recognized over requisite service period ⁽¹⁾
Year ended December 31, 2011		$	5	$	2	$	2	$	1	$	-		N/A		N/A	$	10
Year ended December 31, 2010			N/A	$	4	$	2	$	2	$	1	$	-		N/A	$	9
Year ended December 31, 2009			N/A		N/A	$	9	$	1	$	2	$	2	$	-	$	14

Fair value per unit
At grant date ($)		$	15.66	$	13.09	$	12.60	$	12.44	$	13.37	$	13.80	$	9.19		N/A

Fair value of awards vested during the year
Year ended December 31, 2011		$	-	$	2	$	4	$	3	$	3		N/A		N/A	$	12
Year ended December 31, 2010			N/A	$	-	$	4	$	3	$	3	$	3		N/A	$	13
Year ended December 31, 2009			N/A		N/A	$	-	$	3	$	3	$	3	$	3	$	12

Nonvested awards at December 31, 2011
Unrecognized compensation cost		$	5	$	3	$	2	$	-	$	-		N/A		N/A	$	10
Remaining recognition period (years)			3.0		2.0		1.0		-		-		N/A		N/A		N/A

Assumptions
Grant price ($)		$	68.94	$	54.76	$	42.14	$	48.51	$	52.79	$	51.51	$	36.33		N/A
Expected stock price volatility ⁽²⁾			26%		28%		39%		27%		24%		25%		25%		N/A
Expected term (years) ⁽³⁾			5.3		5.4		5.3		5.3		5.2		5.2		5.2		N/A
Risk-free interest rate ⁽⁴⁾			2.53%		2.44%		1.97%		3.58%		4.12%		4.04%		3.50%		N/A
Dividend rate ($) ⁽⁵⁾		$	1.30	$	1.08	$	1.01	$	0.92	$	0.84	$	0.65	$	0.50		N/A

(1)	Compensation cost is based on the grant date fair value using the Black-Scholes option-pricing model that uses the assumptions at the grant date.

(2)	Based on the average of the historical volatility of the Company's stock over a period commensurate with the expected term of the award and the implied volatility from traded options on the Company's stock.

(3)	Represents the period of time that awards are expected to be outstanding. The Company uses historical data to estimate option exercise and employee termination, and groups of employees that have similar historical exercise behavior are considered separately.

(4)	Based on the implied yield available on zero-coupon government issues with an equivalent term commensurate with the expected term of the awards.

(5)	Based on the annualized dividend rate.

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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- Definition

Tabular disclosure of the description of the plan, the basis for determining contributions, including the employee groups covered, and the nature and effect of significant matters affecting comparability of information for all periods presented. For leveraged ESOPs and pension reversion ESOPs, the disclosure may include the basis for releasing shares and how dividends on allocated and unallocated shares are used. Disclosure may also include a description of the accounting policies followed for ESOP transactions, including the method of measuring compensation, the classification of dividends on ESOP shares, and the treatment of ESOP shares for EPS computations. If the employer has both old ESOP shares for which it does not adopt the latest guidance and new ESOP shares for which the new guidance is required, the accounting policies for both blocks of shares may be described. Disclosure may also include he amount of compensation cost recognized during the period, the number of allocated shares, committed-to-be-released shares, and suspense shares held by the ESOP at the balance-sheet date, the fair value of unearned ESOP shares at the balance-sheet date for shares accounted for under the latest guidance, the existence and nature of any repurchase obligation, including disclosure of the fair value of the shares allocated as of the balance sheet date, which are subject to a repurchase obligation.

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- Definition

Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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