Preferred and Common Stock - Schedule of Share Activity (Detail)					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Outstanding Stock [Member]	Dec. 31, 2012 Outstanding Stock [Member]	Dec. 31, 2011 Outstanding Stock [Member]	Dec. 31, 2013 Treasury Stock [Member]	Dec. 31, 2012 Treasury Stock [Member]	Dec. 31, 2011 Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock, beginning balance	106,895,705	110,694,604	113,494,491	119,362,029
Conversion of convertible notes					310
Private placement							36,518,563
Issued for stock-based compensation plans					3,798,899	2,799,887	5,867,538	(3,798,899)	(2,799,887)	(5,867,538)
Treasury stock, ending balance	106,895,705	110,694,604	113,494,491	119,362,029
Common Stock Outstanding, beginning balance	1,071,011,162	1,067,211,953	1,064,412,066	1,022,025,965
Common Stock Outstanding, ending balance	1,071,011,162	1,067,211,953	1,064,412,066	1,022,025,965