Changes In Common Stock (Detail)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued at January 1	660,888,159	655,251,000
Restricted stock issuances (net of forfeitures)	5,758,000	5,096,000
Stock option exercises	309,000	394,000
Preferred stock conversion	0	111,111
Shares issued at September 30	666,955,284	660,852,000