v2.4.0.6
Defined Contribution and Defined Benefit Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Contribution and Defined Benefit Plans [Abstract]      
Defined Contribution Plan, Cost Recognized $ 10,000,000 $ 9,000,000 $ 9,000,000
Employer Matching Contribution Percentage 100.00%    
Deferral Election Percentage For Employer Matching Contribution 5.00%    
Employee Deferral Limit Percentage 75.00%    
Pension and Other Postretirement Defined Benefit Plans, Liabilities From Acquisition   6,000,000  
Grandfathered Pension Liability Employees   130  
Defined Benefit Plan, Assets for Plan Benefits 10,000,000 8,000,000  
Pension and Other Postretirement Defined Benefit Plans, Liabilities 18,000,000 15,000,000  
Defined Benefit Plan, Amounts Recognized in Balance Sheet 8,000,000 7,000,000  
Defined Benefit Plan, Net Periodic Benefit Cost 1,000,000 9,000,000  
Defined Benefit Plan, Net Periodic Benefit Cost Related To Voluntary Retirement Incentive 8,000,000    
Number Of Employees That Accepted The Voluntray Retirement Incentive 31    
Number Of Employees Eligible For The Voluntray Retirement Incentive 48    
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax 3,000,000 0  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year 3,000,000 8,000,000  
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year 2,000,000    
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter $ 1,000,000