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
Mar. 31, 2016
Dec. 31, 2015
Cost    
Due in one year or less $ 2,015  
Due after one year through three years 429  
Due after three years through five years 15  
Due after five years 72  
Marketable Securities, Debt Maturities, Amortized Cost, Total 2,531  
Equity securities 2  
Total Amortized Cost 2,533 $ 1,994
Estimated Fair Value    
Due in one year or less 1,858  
Due after one year through three years 430  
Due after three years through five years 16  
Due after five years 74  
Marketable Securities, Debt Maturities, Fair Value, Total 2,378  
Equity securities 2  
Total Estimated Fair Value $ 2,380 $ 1,996