XML 83 R64.htm IDEA: XBRL DOCUMENT

Computation of Earnings Per Share (Detail) (Common Stock Equivalents [Member]) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Common Stock Equivalents [Member]
Stock Repurchased During Period, Shares	2.7	5.9	3.9

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References+ Details