Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Common Stock, par value	$ 1.00	$ 1.00
Common Stock, shares authorized	300	300
Common Stock, shares issued	202	202
Common Stock, shares outstanding	120	120
Common Stock in treasury, shares	82	82