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Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
U.S. Dollar notes $ 8,327 $ 8,812
Notes payable 14,199  
Capital leases and other obligations 5 9
Total 14,135 14,668
Less current portion of long-term debt (1,163) (1,451)
Long-term debt 12,972 13,217
Euro notes    
Debt Instrument [Line Items]    
Notes payable 3,653 3,980
Pound sterling notes    
Debt Instrument [Line Items]    
Notes payable 456 418
Swiss franc notes    
Debt Instrument [Line Items]    
Notes payable $ 1,694 $ 1,449