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Commitments And Contingencies (Property Insurance And Other) (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
Apr. 30, 2012
Mar. 31, 2012
Earthquake [Member]
Mar. 31, 2012
Minimum [Member]
Windstorms [Member]
Mar. 31, 2012
Minimum [Member]
Earthquake [Member]
Mar. 31, 2012
Minimum [Member]
Flood [Member]
Mar. 31, 2012
Maximum [Member]
Windstorms [Member]
Mar. 31, 2012
Maximum [Member]
Earthquake [Member]
Mar. 31, 2012
Maximum [Member]
Flood [Member]
Mar. 31, 2012
Facilities Located In Fault Zones [Member]
Earthquake [Member]
Mar. 31, 2012
Letters Of Credit And Surety Bonds [Member]
Mar. 31, 2012
Letters Of Credit And Surety Bonds [Member]
Self-Insurance Programs [Member]
Mar. 31, 2012
Letters Of Credit And Surety Bonds [Member]
Other Debt Guarantees [Member]
Mar. 31, 2012
Puerto Rico [Member]
Earthquake [Member]
Mar. 31, 2012
Illinois [Member]
Dec. 31, 2011
Illinois [Member]
Loss Contingencies [Line Items]                                
Commercial property insurance for catastrophic losses limit per occurrence $ 1,000,000,000   $ 250,000,000             $ 100,000,000            
Commercial property insurance for catastrophic losses deductible limit per occurrence 250,000   250,000     250,000     500,000         25,000,000    
Commercial property insurance for catastrophic losses, deductible rate       3.00% 1.00%   5.00% 5.00%                
Accounts receivable                             73,000,000 54,000,000
Accounts receivable 60 days past due                             50,000,000 41,000,000
Off-balance sheet contingent obligation                     83,000,000 66,000,000 17,000,000      
Estimated pre-tax impact on financial results due to HHS settlement 30,000,000                              
Estimated HHS proceeds   $ 36,000,000