Retirement Benefit Plans (Investments at Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Feb. 02, 2013
Jan. 28, 2012
Investments at fair value $ 47  
Total investment assets at fair value 5,320 5,285
Total liabilities at fair value (270) (108)
Accounts payable, net (15) (1)
Total net assets 5,035 5,176
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs Cash – Cash is valued at cost which approximates fair value, and is classified as level 1 of the fair value hierarchy. Common Collective Trusts – Common collective trusts are pools of investments within cash equivalents, equity and fixed income that are benchmarked relative to a comparable index. They are valued on the basis of the relative interest of each participating investor in the fair value of the underlying assets. The underlying assets are valued at net asset value (NAV) and are classified as level 2 of the fair value hierarchy. Equity Securities – Equity securities are common stocks and preferred stocks valued based on the price of the security as listed on an open active exchange and classified as level 1 of the fair value hierarchy, as well as warrants and preferred stock that are valued at a price, which is based on a broker quote in an over-the-counter market, and are classified as level 2 of the fair value hierarchy. Private Equity – Private equity is composed of interests in private equity funds valued on the basis of the relative interest of each participating investor in the fair value of the underlying assets and/or common stock of privately held companies. There are no observable market values for private equity funds. The valuations for the funds are derived using a combination of different methodologies including (1) the market approach, which consists of analyzing market transactions for comparable assets, (2) the income approach using the discounted cash flow model, or (3) cost method. Private equity funds also provide audited financial statements. Private equity investments are classified as level 3 of the fair value hierarchy. Corporate Bonds – Corporate bonds and Corporate loans are valued at a price which is based on observable market information in primary markets or a broker quote in an over-the-counter market, and are classified as level 2 or level 3 of the fair value hierarchy. Swaps – swap contracts are based on broker quotes in an over-the-counter market and are classified as level 2 of the fair value hierarchy. Government, Municipal Bonds and Mortgaged Backed Securities – Government and municipal securities are valued at a price based on a broker quote in an over-the-counter market and classified as level 2 of the fair value hierarchy. Mortgage backed securities are valued at a price based on observable market information or a broker quote in an over-the-counter market and classified as level 2 of the fair value hierarchy. Other fixed income - non-mortgage asset backed securities, collateral held in short-term investments for derivative contract and derivatives composed of futures contracts, option contracts and other fix income derivates valued at a price based on observable market information or a broker quote in an over-the-counter market and classified as level 2 of the fair value hierarchy. Real Estate – Real estate is comprised of public and private real estate investments. Real estate investments through registered investment companies that trade on an exchange are classified as level 1 of the fair value hierarchy. Investments through open end private real estate funds that are valued at the reported NAV are classified as level 2 of the fair value hierarchy. Private real estate investments through partnership interests that are valued based on different methodologies including discounted cash flow, direct capitalization and market comparable analysis are classified as level 3 of the fair value hierarchy.  
Fair Value, Inputs, Level 1 [Member]
   
Total investment assets at fair value 1,702 1,826
Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 47  
Total investment assets at fair value 3,068 2,869
Total liabilities at fair value (270) (108)
Fair Value, Inputs, Level 3 [Member]
   
Total investment assets at fair value 550 590
Cash and cash equivalents total [Member]
   
Investments at fair value 78 26
Cash and cash equivalents total [Member] | Fair Value, Inputs, Level 1 [Member]
   
Investments at fair value 31 6
Cash and cash equivalents total [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 47 20
Cash, benefit plan [Member]
   
Investments at fair value 31 6
Cash, benefit plan [Member] | Fair Value, Inputs, Level 1 [Member]
   
Investments at fair value 31 6
Common collective trusts [Member]
   
Investments at fair value   20
Common collective trusts [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value   20
Equity securities total [Member]
   
Investments at fair value 2,406 2,790
Equity securities total [Member] | Fair Value, Inputs, Level 1 [Member]
   
Investments at fair value 1,535 1,714
Equity securities total [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 574 777
Equity securities total [Member] | Fair Value, Inputs, Level 3 [Member]
   
Investments at fair value 297 299
Equity securities held within common collective trusts, domestic [Member]
   
Investments at fair value 161 363
Equity securities held within common collective trusts, domestic [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 161 363
Equity securities held within common collective trusts, international [Member]
   
Investments at fair value 407 400
Equity securities held within common collective trusts, international [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 407 400
Equity securities, domestic [Member]
   
Investments at fair value 1,325 1,379
Equity securities, domestic [Member] | Fair Value, Inputs, Level 1 [Member]
   
Investments at fair value 1,325 1,379
Equity securities, international [Member]
   
Investments at fair value 216 349
Equity securities, international [Member] | Fair Value, Inputs, Level 1 [Member]
   
Investments at fair value 210 335
Equity securities, international [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 6 14
Private equity [Member]
   
Investments at fair value 297 299
Private equity [Member] | Fair Value, Inputs, Level 3 [Member]
   
Investments at fair value 297 299
Fixed income total [Member]
   
Investments at fair value 2,455 2,064
Investment Liabilities At Fair Value (270) (108)
Fixed income total [Member] | Fair Value, Inputs, Level 1 [Member]
   
Investments at fair value 3  
Fixed income total [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 2,430 2,028
Investment Liabilities At Fair Value (270) (108)
Fixed income total [Member] | Fair Value, Inputs, Level 3 [Member]
   
Investments at fair value 22 36
Debt securities held within common collective trusts [Member]
   
Investments at fair value 1,171 1,070
Debt securities held within common collective trusts [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 1,171 1,070
Corporate bonds [Member]
   
Investments at fair value 881 719
Corporate bonds [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 871 710
Corporate bonds [Member] | Fair Value, Inputs, Level 3 [Member]
   
Investments at fair value 10 9
Swaps [Member]
   
Investments at fair value 216 104
Investment Liabilities At Fair Value (216) (106)
Swaps [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 216 104
Investment Liabilities At Fair Value (216) (106)
Government securities [Member]
   
Investments at fair value 49 8
Government securities [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 49 8
Corporate loans [Member]
   
Investments at fair value 38 37
Corporate loans [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 26 10
Corporate loans [Member] | Fair Value, Inputs, Level 3 [Member]
   
Investments at fair value 12 27
Municipal bonds [Member]
   
Investments at fair value 54 80
Municipal bonds [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 54 80
Mortgage backed securities [Member]
   
Investments at fair value 8 42
Mortgage backed securities [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 8 42
Other fixed income [Member]
   
Investments at fair value 38 4
Investment Liabilities At Fair Value (54) (2)
Other fixed income [Member] | Fair Value, Inputs, Level 1 [Member]
   
Investments at fair value 3  
Other fixed income [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 35 4
Investment Liabilities At Fair Value (54) (2)
Real estate total [Member]
   
Investments at fair value 381 405
Real estate total [Member] | Fair Value, Inputs, Level 1 [Member]
   
Investments at fair value 133 106
Real estate total [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 17 44
Real estate total [Member] | Fair Value, Inputs, Level 3 [Member]
   
Investments at fair value 231 255
Public REITs [Member]
   
Investments at fair value 133 106
Public REITs [Member] | Fair Value, Inputs, Level 1 [Member]
   
Investments at fair value 133 106
Private real estate [Member]
   
Investments at fair value 248 299
Private real estate [Member] | Fair Value, Inputs, Level 2 [Member]
   
Investments at fair value 17 44
Private real estate [Member] | Fair Value, Inputs, Level 3 [Member]
   
Investments at fair value $ 231 $ 255