Employee Benefit Plans (Details 3)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.94%	[1],[2]	5.69%	[1],[2]
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.70%	[1],[3]	5.93%	[1],[3]	6.49%	[1],[3]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.55%	[1],[3]	5.75%	[1],[3]	6.46%	[1],[3]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	7.00%	[1],[3]	7.50%	[1],[3]	8.00%	[1],[3]
Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.63%	[1],[3]	5.88%	[1],[3]	6.50%	[1],[3]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	8.93%	[1],[3]	8.82%	[1],[3]	8.83%	[1],[3]

[1] Our 2011 and 2010 benefit obligations are measured using a mortality table projected to 2015 and 2013, respectively.(2)

[2] Future compensation levels do not impact our frozen defined benefit pension plans or other postretirement plans and impact only a small portion of our other postemployment liability.

[3] Our assumptions reflect various remeasurements of certain portions of our obligations and represent the weighted average of the assumptions used for each measurement date.