Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended						3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2011 Maximum [Member]	Dec. 31, 2010 Maximum [Member]	Mar. 31, 2010 Canada [Member]	Dec. 31, 2012 Federal [Member]
Income Tax Disclosure [Line Items]
Federal statutory income tax rate	35.00%
Unrecognized tax benefits	$ 6	$ 4
Unrecognized tax benefits, interest on income taxes expense				1	1	1
Settlements							1
Income (loss) from continuing operations before income taxes, foreign	143	86	54
Undistributed earnings of foreign subsidiairies amount	347
Deferred tax assets, operating loss carryforwards, state and local	1,545
Valuation allowance, amount		2		1
Deferred tax assets, operating loss carryforwards, domestic	1,032
Operating loss carryforwards, benefit								$ 16