Quarterly report pursuant to Section 13 or 15(d)

Available-For-Sale Investments - Additional Information (Detail)

v2.4.0.6
Available-For-Sale Investments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Jun. 30, 2012
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, fair value $ 271 $ 296
Available-for-sale securities, amortized cost $ 231 $ 230