Consolidated Statement of Financial Position (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, Authorized shares	2,000,000,000	2,000,000,000
Common stock, Issued shares	814,894,624	814,894,624
Treasury stock, shares	157,409,678	159,846,131