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
Jun. 30, 2015
Dec. 31, 2014
Cost    
Due in one year or less $ 2,039  
Due after one year through three years 428  
Due after three years through five years 14  
Due after five years 73  
Marketable Securities, Debt Maturities, Amortized Cost, Total 2,554  
Equity securities 228  
Total Amortized Cost 2,782 $ 992
Estimated Fair Value    
Due in one year or less 2,039  
Due after one year through three years 428  
Due after three years through five years 15  
Due after five years 73  
Marketable Securities, Debt Maturities, Fair Value, Total 2,555  
Equity securities 237  
Total Estimated Fair Value $ 2,792 $ 992