Derivative Instruments Derivative Instruments (Interest Rate Contracts - Fair Value Hedging Disclosure) (Details) (Fair Value Hedging [Member], Interest Rate Swap [Member], USD $) In Millions, unless otherwise specified	Aug. 31, 2011 Fixed Rate 5.25% Notes Due November 2014 [Member]	Feb. 01, 2014 Fixed Rate 6.90% Notes Due July 2017 [Member]	Jun. 01, 2012 Fixed Rate 6.90% Notes Due July 2017 [Member]	Sep. 30, 2011 Fixed Rate 6.90% Notes Due July 2017 [Member]	Feb. 01, 2014 Fixed Rate 8.50% Notes Due June 2019 [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 213	$ 200	$ 175	$ 150	$ 200
Gain On Terminated Derivatives Recorded In Interest Expense	$ 9		$ 14	$ 12