Retirement Plans (Fair Value Of Pension Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Jan. 28, 2012	Jan. 29, 2011
Fair value of pension investments	$ 81	$ 95
Pension Plan [Member]
Cash and cash equivalents	240	381
Fair value of pension investments	3,099	2,866
Pension Plan [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Cash and cash equivalents	0	0
Fair value of pension investments	251	238
Pension Plan [Member] \| Significant Observable Inputs (Level 2) [Member]
Cash and cash equivalents	240	381
Fair value of pension investments	2,315	2,140
Pension Plan [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Cash and cash equivalents	0	0
Fair value of pension investments	533	488
Pension Plan [Member] \| Equity securities [Member] \| International [Member]
Fair value of pension investments	648	517
Pension Plan [Member] \| Equity securities [Member] \| U.S. [Member]
Fair value of pension investments	805	814
Pension Plan [Member] \| Equity securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| International [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Equity securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| U.S. [Member]
Fair value of pension investments	251	238
Pension Plan [Member] \| Equity securities [Member] \| Significant Observable Inputs (Level 2) [Member] \| International [Member]
Fair value of pension investments	648	517
Pension Plan [Member] \| Equity securities [Member] \| Significant Observable Inputs (Level 2) [Member] \| U.S. [Member]
Fair value of pension investments	554	576
Pension Plan [Member] \| Equity securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| International [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Equity securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| U.S. [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| U.S. Treasury bonds [Member]
Fair value of pension investments	128	54
Pension Plan [Member] \| U.S. Treasury bonds [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| U.S. Treasury bonds [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair value of pension investments	128	54
Pension Plan [Member] \| U.S. Treasury bonds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Other Government bonds [Member]
Fair value of pension investments	31	28
Pension Plan [Member] \| Other Government bonds [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Other Government bonds [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair value of pension investments	31	28
Pension Plan [Member] \| Other Government bonds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Agency backed bonds [Member]
Fair value of pension investments	5	11
Pension Plan [Member] \| Agency backed bonds [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Agency backed bonds [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair value of pension investments	5	11
Pension Plan [Member] \| Agency backed bonds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Corporate bonds [Member]
Fair value of pension investments	310	267
Pension Plan [Member] \| Corporate bonds [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Corporate bonds [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair value of pension investments	310	267
Pension Plan [Member] \| Corporate bonds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Mortgage-backed securities and forwards [Member]
Fair value of pension investments	112	107
Pension Plan [Member] \| Mortgage-backed securities and forwards [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Mortgage-backed securities and forwards [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair value of pension investments	112	107
Pension Plan [Member] \| Mortgage-backed securities and forwards [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Asset-backed securities [Member]
Fair value of pension investments	21	19
Pension Plan [Member] \| Asset-backed securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Asset-backed securities [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair value of pension investments	21	19
Pension Plan [Member] \| Asset-backed securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Pooled funds [Member]
Fair value of pension investments	266	180
Pension Plan [Member] \| Pooled funds [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Pooled funds [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair value of pension investments	266	180
Pension Plan [Member] \| Pooled funds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Real Estate [Member]
Fair value of pension investments	228	201
Pension Plan [Member] \| Real Estate [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Real Estate [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Real Estate [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension investments	228	201
Pension Plan [Member] \| Hedge Funds [Member]
Fair value of pension investments	143	143
Pension Plan [Member] \| Hedge Funds [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Hedge Funds [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Hedge Funds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension investments	143	143
Pension Plan [Member] \| Private equity [Member]
Fair value of pension investments	162	144
Pension Plan [Member] \| Private equity [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Private equity [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair value of pension investments	0	0
Pension Plan [Member] \| Private equity [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension investments	$ 162	$ 144

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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