Available-For-Sale Investments (Summary Of Contractual Maturities Of Available-For-Sale Securities) (Details) (USD $) In Millions	Sep. 30, 2011
Available-For-Sale Investments
Less than one year	$ 1,193
Due in 1-5 years	319
Due in 5-10 years
Due after 10 years	46	[1]
Total	1,558
Asset-based securities that mature over time	$ 38

[1] Includes $38 million of asset-based securities that mature over time and are being reported at their final maturity dates.