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Long Lived Assets and Total Assets by Geographic Segment (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]    
Total long-lived assets $ 59,341 $ 59,804
United States
   
Segment Reporting Information [Line Items]    
Total long-lived assets 17,948 18,160
Other
   
Segment Reporting Information [Line Items]    
Total long-lived assets $ 41,393 $ 41,644