Quarterly report pursuant to Section 13 or 15(d)

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

v2.3.0.15
Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Cost    
Due in one year or less $ 686  
Due after one year through three years 192  
Due after three years through five years 85  
Due after five years 346  
Marketable Securities, Debt Maturities, Amortized Cost, Total 1,309  
Equity securities 1  
Marketable Securities, Amortized Cost, Total 1,310  
Estimated Fair Value    
Due in one year or less 685  
Due after one year through three years 193  
Due after three years through five years 85  
Due after five years 356  
Marketable Securities, Debt Maturities, Fair Value, Total 1,319  
Equity securities 1  
Estimated Fair Value $ 1,320 $ 883