Annual report pursuant to Section 13 and 15(d)

Retirement Benefit Plans (Level 3 Investment Assets) (Details)

v2.4.0.6
Retirement Benefit Plans (Level 3 Investment Assets) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 28, 2012
Jan. 29, 2011
Corporate bonds [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of year $ 4  
Transfers, net 11  
Realized gains   4
Unrealized gains/(losses) (1)  
Purchases and issuances 33  
Sales, maturities and settlements (11)  
Balance, end of year 36 4
Private Equity Funds [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of year 291 252
Realized gains 33 21
Unrealized gains/(losses) (17) 19
Purchases and issuances 53 46
Sales, maturities and settlements (61) (47)
Balance, end of year 299 291
Real Estate [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of year 251 231
Realized gains 10 15
Unrealized gains/(losses) 24 (31)
Purchases and issuances 12 61
Sales, maturities and settlements (42) (25)
Balance, end of year $ 255 $ 251