Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Receivables, allowances for doubtful accounts (in dollars)	$ 28	$ 21
Property, Plant and Equipment, accumulated depreciation (in dollars)	$ 7,871	$ 7,678
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized shares	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	293,333,333	293,333,333
Common stock, shares issued	216,216,956	207,913,428
Common stock, shares outstanding	216,216,956	207,913,428