The tax effect as of the balance sheet date of the amount of excess of tax deductions over gross income in a year which cannot be used on the tax return of the country of domicile in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

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The tax effect as of the balance sheet date of the amount of excess of tax deductions over gross income in a year which cannot be used on the tax return of a state or local jurisdiction in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

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- Definition

This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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- Definition

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended					3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Maximum [Member]	Dec. 31, 2010 Maximum [Member]	Mar. 31, 2010 Canada	Dec. 31, 2009 Canada
Income Tax Disclosure [Line Items]
Unrecognized Tax Benefits	$ 4	$ 4	$ 6
Unrecognized Tax Benefits, Interest on Income Taxes Expense				1	1
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	0	2				1	3
Income (Loss) from Continuing Operations before Income Taxes, Foreign	86	54	25
Undistributed Earnings Of Foreign Subsidiairies Amount	232
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	1,080
Valuation Allowance, Amount	2	2
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	$ 136