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Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
U.S. Dollar notes $ 8,812 $ 8,371
Notes payable 14,737  
Capital leases and other obligations 9 12
Total 14,668 15,162
Less current portion of long-term debt (1,451) (605)
Long-term debt 13,217 14,557
Euro notes    
Debt Instrument [Line Items]    
Notes payable 3,980 4,305
Pound sterling notes    
Debt Instrument [Line Items]    
Notes payable 418 1,399
Swiss franc notes    
Debt Instrument [Line Items]    
Notes payable $ 1,449 $ 1,075