Investments - Maturities of Available for Sale and Held to Maturity Securities (Details) (USD $) In Millions, unless otherwise specified	Sep. 01, 2013
Available-For-Sale, Cost Basis
Due in one year or less	$ 628
Due after one year through five years	632
Due after five years	17
Available-For-Sale, Cost Basis, Total	1,277
Available-For-Sale, Fair Value
Due in one year or less	628
Due after one year through five years	632
Due after five years	17
Available-for-sale, Recorded Basis, Total	1,277
Held-To-Maturity
Due in one year or less	203
Due after one year through five years	0
Due after five years	0
Held-To-Maturity, Cost Basis, Total	$ 203