Investments (Maturities Of Securities Excluding Trading Securities) (Details) (USD $) In Millions, unless otherwise specified	Nov. 20, 2011
Investments [Abstract]
Available-For-Sale, cost basis due in one year or less	$ 1,044
Available-For-Sale, cost basis due after one year through five years	312
Available-For-Sale, cost basis due after five years	5
Available-For-Sale, cost basis, total	1,361
Available-For-Sale, fair value due in one year or less	1,047
Available-For-Sale, fair value due after one year through five years	317
Available-For-Sale, fair value due after five years	5
Available-For-Sale, fair value, total	1,369
Held-To-Maturity, cost basis due in one year or less	227
Held-To-Maturity, cost basis due after one year through five years	0
Held-To-Maturity, cost basis due after five years	0
Held-To-Maturity, cost basis, total	227
Held-To-Maturity, fair value due in one year or less	227
Held-To-Maturity, fair value due after one year through five years	0
Held-To-Maturity, fair value due after five years	0
Held-To-Maturity, fair value, total	$ 227