Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Preferred stock, no par value			[1]
Preferred stock, authorized	1,000,000	1,000,000	[1]
Preferred stock, issued	0	0	[1]
Common stock, par value	$ 1	$ 1	[1]
Common stock, authorized	1,200,000,000	1,200,000,000	[1]
Common stock, issued	357,100,000	356,800,000	[1]
Treasury stock, shares	400,000	400,000	[1]

[1] The December 31, 2011 consolidated balance sheet has been derived from audited financial statements.