Retirement Benefit Plans (Net Periodic Expense) (Details) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 2 Months Ended 3 Months Ended
Oct. 27, 2012
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Sep. 30, 2012
Sep. 30, 2012
participant
Feb. 02, 2013
Nov. 30, 2012
participant
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Curtailments charges $ 7,000,000              
Discount rate   3.87% 4.89% 4.19% 4.25% 4.25% 4.19%  
Defined benefit plan, description of plan amendment In September 2012, as a result of a plan amendment, we offered approximately 35,000 participants in the Primary Pension Plan who separated from service and had a deferred vested benefit as of August 31, 2012 the option to receive a lump-sum settlement payment. These participants had until November 30, 2012 to elect to receive the lump-sum settlement payment with the payments to be made by the Company beginning on December 4, 2012 using assets from the Primary Pension Plan.  As a result of the approximately 25,000 participants who elected the lump-sum settlements, we made payments totaling $439 million from the Primary Pension Plan’s assets and recognized settlement expense of $148 million for unrecognized actuarial losses.  We also amended the Primary Pension Plan to allow for participants that separate from the Company on or after September 1, 2012 the option of a lump-sum settlement payment from the plan.  The amendment also provided for automatic lump-sum settlement payments for participants with vested balances less than $5,000.              
Automatic lump sum settlement, maximum vested balance (less than)   5,000            
Funded status of plan percentage, description   As of the end of 2014, the funded status of the Primary Pension Plan was 104%. The PBO is the present value of benefits earned to date by plan participants, including the effect of assumed future salary increases. Under the Employee Retirement Income Security Act of 1974 (ERISA), the funded status of the plan exceeded 100% as of December 31, 2014 and 2013, the qualified pension plan’s year end.            
Net Periodic Benefit Expense/(Income) [Abstract]                
Net periodic benefit expense/(income)   6,000,000 137,000,000 353,000,000        
Pension Plan [Member]                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Projected benefit obligation, period increase/(decrease)         166,000,000      
Effect of curtailments on projected benefit obligation 80,000,000              
Balance at measurement date   5,254,000,000 4,477,000,000 5,042,000,000 5,550,000,000 5,550,000,000 5,042,000,000  
Number of employees offered lump sum settlement           35,000    
Number of employees that accepted lump sum settlement               25,000
Payments for lump sum settlement             439,000,000  
Net Periodic Benefit Expense/(Income) [Abstract]                
Service cost   61,000,000 78,000,000 87,000,000        
Interest cost   211,000,000 204,000,000 242,000,000        
Expected return on plan assets   (348,000,000) (340,000,000) (382,000,000)        
Amortization of actuarial loss/(gain)   52,000,000 152,000,000 220,000,000        
Amortization of prior service cost/(credit)   7,000,000 6,000,000 0        
Settlement expense   0 0 148,000,000     (148,000,000)  
Loss/(gain) on transfer of benefits   15,000,000 0 0        
Net periodic benefit expense/(income)   (2,000,000) 100,000,000 315,000,000        
Supplemental Employee Retirement Plan [Member]                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Employee retirement age   60 years            
Termination of company-paid term life insurance, employee age   70 years            
Termination of employee-paid term life insurance, employee age   65 years            
Projected benefit obligation, period increase/(decrease)         55,000,000      
Effect of curtailments on projected benefit obligation 13,000,000              
Balance at measurement date   191,000,000 219,000,000 303,000,000 300,000,000 300,000,000 303,000,000  
Net Periodic Benefit Expense/(Income) [Abstract]                
Service cost   0 0 1,000,000        
Interest cost   9,000,000 12,000,000 13,000,000        
Amortization of actuarial loss/(gain)   14,000,000 24,000,000 23,000,000        
Amortization of prior service cost/(credit)   0 1,000,000 1,000,000        
Loss/(gain) on transfer of benefits   (15,000,000) 0 0        
Net periodic benefit expense/(income)   8,000,000 37,000,000 38,000,000        
Supplemental Employee Retirement Plan [Member] | Minimum [Member]                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Employee retirement age for equal social security benefits   60 years            
Supplemental Employee Retirement Plan [Member] | Maximum [Member]                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Employee retirement age for equal social security benefits   62 years            
Primary and Supplemental Pension Plans Total                
Net Periodic Benefit Expense/(Income) [Abstract]                
Service cost   61,000,000 78,000,000 88,000,000        
Interest cost   220,000,000 216,000,000 255,000,000        
Expected return on plan assets   (348,000,000) (340,000,000) (382,000,000)        
Amortization of actuarial loss/(gain)   66,000,000 176,000,000 243,000,000        
Amortization of prior service cost/(credit)   7,000,000 7,000,000 1,000,000        
Settlement expense   0 0 148,000,000        
Loss/(gain) on transfer of benefits   0 0 0        
Net periodic benefit expense/(income)   6,000,000 137,000,000 353,000,000        
Social Security Benefits [Member]                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Employee retirement age   62 years            
Primary Pension Plan and Benefit Restoration Plan [Member]                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Employee retirement age   65 years            
Other Postretirement Benefit Plan, Defined Benefit [Member]                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Projected benefit obligation, period increase/(decrease)         (5,000,000)      
Effect of curtailments on projected benefit obligation 2,000,000              
Balance at measurement date   11,000,000 15,000,000 18,000,000 18,000,000 18,000,000 18,000,000  
Net Periodic Benefit Expense/(Income) [Abstract]                
Interest cost   1,000,000 1,000,000 1,000,000        
Amortization of actuarial loss/(gain)   (1,000,000) (1,000,000) (1,000,000)        
Amortization of prior service cost/(credit)   (8,000,000) (8,000,000) (14,000,000)        
Net periodic benefit expense/(income)   $ (8,000,000) $ (8,000,000) $ (14,000,000)