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
Sep. 30, 2015
Dec. 31, 2014
Cost    
Due in one year or less $ 1,423  
Due after one year through three years 420  
Due after three years through five years 14  
Due after five years 71  
Marketable Securities, Debt Maturities, Amortized Cost, Total 1,928  
Equity securities 282  
Total Amortized Cost 2,210 $ 992
Estimated Fair Value    
Due in one year or less 1,423  
Due after one year through three years 421  
Due after three years through five years 15  
Due after five years 71  
Marketable Securities, Debt Maturities, Fair Value, Total 1,930  
Equity securities 318  
Total Estimated Fair Value $ 2,248 $ 992