Statements of Consolidated Stockholders' Equity and Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Millions, except Per Share data	6 Months Ended
	Jun. 30, 2011
Tax effect of foreign currency translation adjustment	$ 0
Tax effect of sale of Union VEBA shares by the Union VEBA	24.7
Cash dividends declared on common stock (per share)	$ 0.48
Additional Capital
Tax effect of sale of Union VEBA shares by the Union VEBA	24.7
Retained Earnings
Cash dividends declared on common stock (per share)	$ 0.48
Accumulated Other Comprehensive Income (Loss)
Tax effect of foreign currency translation adjustment	0
Common Stock Owned by Union VEBA Subject to Transfer Restriction
Tax effect of sale of Union VEBA shares by the Union VEBA	$ 24.7