Derivative Instruments Interest Rate Fair Value Hedges on Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Aug. 31, 2011 2014 Notes [Member]	Jun. 01, 2012 2017 Notes [Member]	Sep. 30, 2011 2017 Notes [Member]	Oct. 27, 2012 Fixed Rate 6.90% Notes Due July 2017 [Member]	Jan. 28, 2012 Fixed Rate 6.90% Notes Due July 2017 [Member]	Oct. 29, 2011 Fixed Rate 6.90% Notes Due July 2017 [Member]	Aug. 31, 2011 Interest Rate Swap [Member] 2014 Notes [Member]	Jun. 01, 2012 Interest Rate Swap [Member] 2017 Notes [Member]	Sep. 30, 2011 Interest Rate Swap [Member] 2017 Notes [Member]
Derivative [Line Items]
Notional Amount of Interest Rate Fair Value Hedge Derivatives	$ 213	$ 175	$ 150	$ 0	$ 175	$ 175
Gain on Terminated Derivatives Recorded In Interest Expense							$ 9	$ 14	$ 12