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, 2016
Dec. 31, 2015
Cost    
Due in one year or less $ 1,227  
Due after one year through three years 453  
Due after three years through five years 17  
Due after five years 72  
Marketable Securities, Debt Maturities, Amortized Cost, Total 1,769  
Equity securities 435  
Total Amortized Cost 2,204 $ 1,994
Estimated Fair Value    
Due in one year or less 1,228  
Due after one year through three years 454  
Due after three years through five years 17  
Due after five years 75  
Marketable Securities, Debt Maturities, Fair Value, Total 1,774  
Equity securities 285  
Total Estimated Fair Value $ 2,059 $ 1,996