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
Sep. 30, 2014
Dec. 31, 2013
Cost    
Due in one year or less $ 807  
Due after one year through three years 450  
Due after three years through five years 15  
Due after five years 93  
Marketable Securities, Debt Maturities, Amortized Cost, Total 1,365  
Equity securities 2  
Total Amortized Cost 1,367 582
Estimated Fair Value    
Due in one year or less 807  
Due after one year through three years 450  
Due after three years through five years 15  
Due after five years 93  
Marketable Securities, Debt Maturities, Fair Value, Total 1,365  
Equity securities 2  
Total Estimated Fair Value $ 1,367 $ 580