Quarterly report pursuant to Section 13 or 15(d)

Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail)

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Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Cost    
Due in one year or less $ 990  
Due after one year through three years 445  
Due after three years through five years 15  
Due after five years 90  
Marketable Securities, Debt Maturities, Amortized Cost, Total 1,540  
Equity securities 2  
Total Amortized Cost 1,542 582
Estimated Fair Value    
Due in one year or less 990  
Due after one year through three years 445  
Due after three years through five years 15  
Due after five years 91  
Marketable Securities, Debt Maturities, Fair Value, Total 1,541  
Equity securities 2  
Total Estimated Fair Value $ 1,543