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Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
U.S. Dollar notes $ 8,371 $ 10,836
Notes payable 15,232  
Capital leases and other obligations 12 31
Total 15,162 15,351
Less current portion of long-term debt (605) (1,530)
Long-term debt 14,557 13,821
Euro notes    
Debt Instrument [Line Items]    
Notes payable 4,305 3,911
Pound sterling notes    
Debt Instrument [Line Items]    
Notes payable 1,399 $ 573
Swiss franc notes    
Debt Instrument [Line Items]    
Notes payable $ 1,075