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Segment Information - Total Assets Fixed Assets Net and Total Fixed Asset Additions By Segment (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 40,159 $ 32,555
Property and equipment, net 10,949 7,060
Total property and equipment additions 6,373 4,317
North America
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 26,108 20,703
Property and equipment, net 8,447 5,481
Total property and equipment additions 4,837 3,348
International
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 14,051 11,852
Property and equipment, net 2,502 1,579
Total property and equipment additions $ 1,536 $ 969