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, 2019
Dec. 31, 2018
Cost    
Due in one year or less $ 147  
Due after one year through three years 472  
Due after three years through five years 21  
Due after five years 77  
Marketable Securities, Debt Maturities, Amortized Cost, Total 717  
Equity securities 2  
Total Amortized Cost 719 $ 813
Estimated Fair Value    
Due in one year or less 147  
Due after one year through three years 474  
Due after three years through five years 22  
Due after five years 80  
Marketable Securities, Debt Maturities, Fair Value, Total 723  
Equity securities 2  
Total Estimated Fair Value $ 725 $ 810