Income Taxes Income Taxes - Tax Credit Carryforwards (Details 3) (USD $) In Millions	Sep. 01, 2011
Federal [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 206
State [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 215

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 48

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 17

-Subparagraph a

Name:	us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant