Quarterly report pursuant to Section 13 or 15(d)

Retirement Benefit Plans (Net Periodic Expense) (Details)

v3.8.0.1
Retirement Benefit Plans (Net Periodic Expense) (Details)
$ in Millions
3 Months Ended
May 05, 2018
USD ($)
Apr. 29, 2017
USD ($)
employee
Feb. 03, 2018
Rate
Mar. 31, 2017
Rate
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Number of employees eligible for VERP | employee   6,000    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | Rate     4.40% 4.34%
Service cost $ 9 $ 11    
Interest cost 35 39    
Expected return on plan assets (56) (54)    
Amortization of prior service cost/(credit) 2 2    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 7    
Net periodic benefit expense/(income) (10) $ 117    
Number of employees accepted VERP | employee   2,800    
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits 0 $ 112    
Other components of net periodic pension cost/(income) $ (19) 106 [1]    
Primary Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Funded Status of Plan, Percent | Rate       98.00%
Defined benefit plan increase (decrease) in fair value of assets due to remeasurement and curtailment   34    
Defined benefit plan obligation increase (decrease) due to remeasurement and curtailment   3    
Defined benefit plan increase (decrease) due to enhanced retirement benefits   88    
Supplemental Pension Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined benefit plan obligation increase (decrease) due to remeasurement and curtailment   (3)    
Defined benefit plan increase (decrease) due to enhanced retirement benefits   $ 24    
[1] As Adjusted