Quarterly report pursuant to Section 13 or 15(d)

Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail)

v3.7.0.1
Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Cost    
Due in one year or less $ 355  
Due after one year through three years 427  
Due after three years through five years 22  
Due after five years 162  
Marketable Securities, Debt Maturities, Amortized Cost, Total 966  
Equity securities 83  
Total Amortized Cost 1,049 $ 1,083
Estimated Fair Value    
Due in one year or less 355  
Due after one year through three years 425  
Due after three years through five years 22  
Due after five years 162  
Marketable Securities, Debt Maturities, Fair Value, Total 964  
Equity securities 67  
Total Estimated Fair Value $ 1,031 $ 1,091