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Impairments (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property and equipment        
Impairment of certain corporate assets   $ 17    
Impairment of goodwill and other indefinite Lived intangible assets        
Estimate of loss on impairment of goodwill per diluted share       $ 16.15
Estimated loss on impairment of goodwill, tax effect 0     0
Adjustment to original estimate of goodwill 118   118 5,200
Adjustment to original estimate of goodwill, per diluted share $ 0.33   $ 0.33  
Adjustment to original estimate of goodwill, tax effect     0  
Assets Held for Sale
       
Assets held for sale        
Aggregate loss on impairment of assets held for sale   64    
Aggregate loss on impairment of assets per diluted share   $ 0.17    
Aggregate loss on impairment of assets held for sale, tax effect   $ 0