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Segment and Related Information - Summary of Property and Equipment (Net) Relating to Operations by Segment (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Entity Wide Disclosure On Geographic Areas Long Lived Asset In Entitys Country Of Domicile And Foreign Countries [Line Items]      
Property and equipment, net $ 12,344 $ 12,651 $ 12,242
United States and Puerto Rico [Member]
     
Entity Wide Disclosure On Geographic Areas Long Lived Asset In Entitys Country Of Domicile And Foreign Countries [Line Items]      
Property and equipment, net 11,198 11,293 10,948
Canada [Member]
     
Entity Wide Disclosure On Geographic Areas Long Lived Asset In Entitys Country Of Domicile And Foreign Countries [Line Items]      
Property and equipment, net $ 1,146 $ 1,358 $ 1,294