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Contingencies (Columbia-Related Loss Contingencies) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
lawsuit
Nov. 30, 2012
lawsuit
Feb. 28, 2010
lawsuit
ATS Lawsuits
     
Loss Contingencies      
Number of tort lawsuits filed against the company 9    
Minimum number of alleged victims at the balance sheet date 6,000    
Number of lawsuits seeking unspecified compensatory and punitive damages as well as attorneys' fees and costs 8    
Number of lawsuits seeking treble damages and disgorgement of profits without explanation 1    
Specific demand in compensatory damage $ 10    
Specific demand in punitive damage $ 10    
ATA Lawsuits
     
Loss Contingencies      
Number of tort lawsuits filed against the company 4    
Number of lawsuits for which the motion to dismiss was granted in part and denied in part     1
Number of lawsuits dismissed after the parties reached a confidential settlement agreement   1