Retirement Benefit Plans (Tables)
 3 Months Ended
May 02, 2020
Retirement Benefit Plans [Abstract]  
Schedule of Pension Plan Expense/(Income)
The components of net periodic pension expense/(income) for our non-contributory qualified defined benefit pension plan and supplemental pension plans were as follows:
 Three Months Ended
($ in millions)May 2,
2020		May 4,
2019
Service cost$8  $7  
Other components of net periodic pension cost/(income):
Interest cost26  33  
Expected return on plan assets(50) (48) 
Amortization of prior service cost/(credit)1  2  
(23) (13) 
Net periodic pension expense/(income)$(15) $(6)