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Available-For-Sale Investments (Summary Of Maturities Of Available-For-Sale Securities) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Available-For-Sale Investments [Abstract]  
Less than one year $ 1,031
Due in 1-5 years 306
Due in 5-10 years   
Due after 10 years 35 [1]
Total 1,372
Asset-based securities that mature over time $ 35
[1] Includes $35 million of asset-based securities that mature over time and are being reported at their final maturity dates.