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Impairments (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Property and equipment      
Impairment of certain corporate assets $ 17 $ 17  
Impairment of goodwill and other indefinite Lived intangible assets      
Adjustment to original estimate of goodwill     118
Adjustment to original estimate of goodwill, per diluted share     $ 0.33
Adjustment to original estimate of goodwill, tax effect     0
Assets Held for Sale
     
Assets held for sale      
Loss on impairment of assets held for sale   37  
Loss on impairment of assets per diluted share   $ 0.10  
Loss on impairment of assets held for sale, tax effect   $ 0