Retirement Benefit Plans (Obligations and Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Feb. 03, 2018
Jan. 28, 2017
Jan. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Liability, Defined Benefit Pension Plan, Noncurrent $ 0 $ 18  
Prepaid pension 61 0  
Change in fair value of plan assets      
Increase/(Decrease) in funded status of plan $ (79)    
Actual return on plan assets (percent) 14.10%    
Cumulative return on plan assets since inception (percent) 9.00%    
Pension Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Prepaid pension $ 61    
Liability, Defined Benefit Plan, Noncurrent   18  
Funded status of the plan (percent) 102.00%    
Change in APBO      
Beginning balance $ 3,473 3,327  
Service cost 42 55 $ 69
Interest cost 143 153 196
Actuarial loss/(gain) 126 151  
Balance at measurement date 3,467 3,473 3,327
Change in fair value of plan assets      
Beginning Balance 3,455 3,287  
Company contributions 0 0  
Actual return on assets [1] 451 381  
Balance at measurement date 3,528 3,455 3,287
Funded status of the plan [2] 61 (18)  
Settlements (217) 0  
Curtailments (27) 0  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 161 213  
Supplemental Employee Retirement Plan [Member]      
Change in APBO      
Beginning balance 152 176  
Service cost 0 0 0
Interest cost 7 7 7
Actuarial loss/(gain) 31 10  
Balance at measurement date 182 152 176
Change in fair value of plan assets      
Beginning Balance 0 0  
Company contributions 35 41  
Actual return on assets 0 0  
Balance at measurement date 0 0 $ 0
Funded status of the plan [3] (182) (152)  
Current portion of pension plan liability accrued 29 26  
Settlements 0 0  
Curtailments 3 0  
Defined Benefit Plan, Benefit Obligation, Benefits Paid $ 35 $ 41  
Exceeded 100% [Member] | Pension Plan [Member]      
Change in fair value of plan assets      
Defined Benefit Plan, Funded Percentage 100.00%    
[1] Includes plan administrative expenses.
[2] $61 million in 2017 was included in Prepaid pension and $18 million in 2016 was included in Other liabilities in the Consolidated Balance Sheets.
[3] $29 million in 2017 and $26 million in 2016 were included in Other accounts payable and accrued expenses on the Consolidated Balance Sheets, and the remaining amounts were included in Other liabilities.