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Segment and Related Information - Summary of Property and Equipment Net of Accumulated Depreciation and Amortization Relating to Operations by Segment (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property and equipment, net $ 10,950 $ 10,665 $ 10,657
United States and Puerto Rico [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property and equipment, net 10,040 9,778 9,586
Canada [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property and equipment, net $ 910 $ 887 $ 1,071