Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended			9 Months Ended		1 Months Ended	9 Months Ended
	Nov. 30, 2010 D	Jun. 30, 2010 Income tax litigation D	Jan. 31, 2011 Environmental Matters entity	Sep. 30, 2011 Environmental Matters count	Sep. 30, 2011 Environmental Matters Walter Coke property	Nov. 30, 2009 Potential Securities Class Action director	Sep. 30, 2011 Potential Securities Class Action	Sep. 30, 2011 Other
Commitments and contingencies
Extension of time to submit the proposed final order (in days)	90
Number of days to respond to audit findings by the Internal Revenue Service (in days)		30
Number of properties that the entity has agreed to remediate					23
Number of cases into which ruling are consolidated				1
Amount of civil penalties that environmental interest group seeks for selenium violations				$ 14
Number of environmental interest groups filing Clean Water Act citizen's suit			3
Number of non-executive directors as defendants						2
General damages entitled to recover							200
Punitive damages entitled to recover							20
Undistributed Foreign Earnings								$ 42