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, 2016
Dec. 31, 2015
Cost    
Due in one year or less $ 1,816  
Due after one year through three years 449  
Due after three years through five years 15  
Due after five years 71  
Marketable Securities, Debt Maturities, Amortized Cost, Total 2,351  
Equity securities 433  
Total Amortized Cost 2,784 $ 1,994
Estimated Fair Value    
Due in one year or less 1,816  
Due after one year through three years 452  
Due after three years through five years 15  
Due after five years 75  
Marketable Securities, Debt Maturities, Fair Value, Total 2,358  
Equity securities 255  
Total Estimated Fair Value $ 2,613 $ 1,996