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Long-term Debt - Long-term Debt (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Proforma Debt Instrument [Line Items]    
Long-term debt, carrying amount $ 11,120 $ 10,393
3.30% Senior Notes due 2021
   
Proforma Debt Instrument [Line Items]    
Long-term debt, carrying amount 1,596 1,596
3.65% Senior Notes due 2023
   
Proforma Debt Instrument [Line Items]    
Long-term debt, carrying amount 1,495 1,495
2.75% Guaranteed Notes due 2015
   
Proforma Debt Instrument [Line Items]    
Long-term debt, carrying amount 1,374 1,373
1.95% Senior Notes due 2016
   
Proforma Debt Instrument [Line Items]    
Long-term debt, carrying amount 1,099 1,099
4.20% Senior Notes due 2021
   
Proforma Debt Instrument [Line Items]    
Long-term debt, carrying amount 1,100 1,099
1.25% Senior Notes due 2017
   
Proforma Debt Instrument [Line Items]    
Long-term debt, carrying amount 1,000 999
2.40% Senior Notes due 2022
   
Proforma Debt Instrument [Line Items]    
Long-term debt, carrying amount 999 999
1.50% Guaranteed Notes due 2019
   
Proforma Debt Instrument [Line Items]    
Long-term debt, carrying amount 690 697
2.65% Senior Notes due 2016
   
Proforma Debt Instrument [Line Items]    
Long-term debt, carrying amount 500 500
Commercial Paper Borrowings
   
Proforma Debt Instrument [Line Items]    
Long-term debt, carrying amount 800  
Other
   
Proforma Debt Instrument [Line Items]    
Long-term debt, carrying amount $ 467 $ 536