CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Accounts and notes receivable, allowance for doubtful accounts	$ 61,804,000	$ 57,385,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, authorized	25,000,000	25,000,000
Preferred stock, outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	6,000,000,000	6,000,000,000
Common stock, issued	2,048,890,000	2,069,246,000
Common stock, outstanding	2,048,890,000	2,069,246,000