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
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Dec. 31, 2012
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Dec. 31, 2011
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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]
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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]
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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 |