Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Preferred stock, par value per share (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	4,000,000	4,000,000
Common stock, par value per share (in dollars per share)	$ 0.01	$ 3.333
Common stock, shares authorized (in shares)	500,000,000	250,000,000
Common stock, shares issued (in shares)	198,000,000	197,000,000
Treasury stock, shares (in shares)	19,000,000	19,000,000