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Stock Based Compensation (Details 2) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($) Y	Dec. 31, 2010 CAD	Dec. 31, 2009 USD ($) Y	Dec. 31, 2009 CAD
Fair value of stock options granted and the compensation expenses
Risk-free interest rate		2.26%	2.26%	1.66%	1.66%
Expected dividend yield		2.00%	2.00%	2.05%	2.05%
Expected volatility		35.00%	35.00%	31.00%	31.00%
Expected time until exercise		4	4	4	4
Weighted average fair value of options granted or modified in year			10.00		3.60
Compensation expense recorded in selling, general and administrative expense	$ 21	$ 43		$ 4

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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