Statements of Consolidated Stockholders' Equity (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Additional Paid in Capital
Tax effect on release of restriction on Union VEBA shares	$ 0	$ 41.3	$ 25.0
Retained Earnings
Cash dividends declared on common stock (per share)	$ 1.20	$ 1.00	$ 0.96