Annual report pursuant to Section 13 and 15(d)

Postretirement Health Care and Life Insurance Benefits (Weighted Average Assumptions Used To Determine Projected Benefit Obligations For Postretirement Obligations) (Details)

v3.20.1
Postretirement Health Care and Life Insurance Benefits (Weighted Average Assumptions Used To Determine Projected Benefit Obligations For Postretirement Obligations) (Details)
Feb. 01, 2020
Feb. 02, 2019
Other Postretirement Benefits Plan [Member]    
Discount rate 2.81% 4.02%