XML 1081 R80.htm IDEA: XBRL DOCUMENT

Business Divestitures - Summarized Results of Operations for Discontinued Operations (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2011	Dec. 31, 2010
Discontinued Operations And Disposal Groups [Abstract]
Loss on sale of discontinued operations	$ (1)	$ (1)	$ 5
Tax effect			$ 3

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

Amount of tax expense or benefit on gain (loss), not previously recognized, resulting from the sale of a business component.