Retirement Benefit Plans (Net Periodic Expense) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 07, 2015
USD ($)
employee
Aug. 03, 2015
employee
Jan. 30, 2016
USD ($)
Jan. 30, 2016
USD ($)
Oct. 31, 2015
employee
Jan. 28, 2017
USD ($)
Jan. 30, 2016
USD ($)
Jan. 31, 2015
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Discount rate     4.73% 4.73%   4.40% 4.73% 3.87%
Defined benefit plan, description of plan amendment           In August 2015, as a result of a plan amendment, we offered approximately 31,000 retirees and beneficiaries in the Primary Pension Plan who commenced their benefit between January 1, 2000 and August 31, 2012 the option to receive a lump-sum settlement payment. In addition, we offered approximately 8,000 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. Approximately 12,000 retirees and beneficiaries elected to receive voluntary lump-sum payments to settle the Primary Pension Plan's obligation to them. In addition, approximately 1,900 former employees having deferred vested benefits elected to receive lump-sums. The lump-sum settlement payments totaling approximately $700 million were made by the Company on November 5, 2015 using assets from the Primary Pension Plan. On December 7, 2015, the Company completed the purchase of a group annuity contract that transferred to The Prudential Insurance Company of America the pension benefit obligation of approximately 18,000 retirees totaling approximately $800 million. Actuarial loss of $180 million was recognized as settlement expense as a result of the lump-sum offer payment and the purchase of the group annuity contract.    
Funded status of plan percentage, description           As of the end of 2016, the funded status of the Primary Pension Plan was 99%. The Primary Benefit Obligation (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, 2016 and 2015, the qualified pension plan’s year end.    
Number of employees offered lump sum settlement | employee   31,000            
Participants Who Separated From Service | employee   8,000            
Number of employees accepted lump sum settlement | employee         12,000      
Participants Who Separated From Service and Accepted | employee         1,900      
Net Periodic Benefit Expense/(Income) [Abstract]                
Net periodic benefit expense/(income)           $ 19 $ 162 $ (48)
Pension Plan [Member]                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Transfer of supplemental pension plan benefits           0 1,555  
Defined Benefit Plan, Settlements, Plan Assets           0 (1,555)  
Balance at measurement date     $ 3,327 $ 3,327   3,473 3,327 5,254
Payments for lump sum settlement     717          
Number of retirees for which pension obligation transferred | employee 18,000              
DefinedBenefitPlansandOtherPostretirementBenefitPlansTransferredPensionBenefitObligation $ 838              
Net Periodic Benefit Expense/(Income) [Abstract]                
Service cost           55 69 61
Interest cost           153 196 211
Expected return on plan assets           (215) (357) (348)
Actuarial loss/(gain)           0 52 0
Amortization of prior service cost/(credit)           8 8 7
Settlement expense       (180)   0 180 0
Other           0 6  
Loss/(gain) on transfer of benefits           0 0 51
Net periodic benefit expense/(income)           1 154 (18)
Supplemental Employee Retirement Plan [Member]                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Transfer of supplemental pension plan benefits           0 0 56
Defined Benefit Plan, Settlements, Plan Assets           $ 0 0  
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    
Balance at measurement date     $ 176 $ 176   $ 152 176 191
Net Periodic Benefit Expense/(Income) [Abstract]                
Service cost           0 0 0
Interest cost           7 7 9
Actuarial loss/(gain)           11 1 12
Amortization of prior service cost/(credit)           0 0 0
Loss/(gain) on transfer of benefits           0 0 (51)
Net periodic benefit expense/(income)           $ 18 8 (30)
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           $ 55 69 61
Interest cost           160 203 220
Expected return on plan assets           (215) (357) (348)
Actuarial loss/(gain)           11 53 12
Amortization of prior service cost/(credit)           8 8 7
Settlement expense           0 180 0
Other           0 6 0
Loss/(gain) on transfer of benefits           0 0 0
Net periodic benefit expense/(income)           $ 19 162 (48)
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]                
Net Periodic Benefit Expense/(Income) [Abstract]                
Net periodic benefit expense/(income)           $ (17) $ (7) $ (8)