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)

v3.21.1
Postretirement Health Care and Life Insurance Benefits (Weighted Average Assumptions Used To Determine Projected Benefit Obligations For Postretirement Obligations) (Details)
Jan. 30, 2021
Feb. 01, 2020
Other Postretirement Benefits Plan [Member]    
Discount rate 2.32% 2.81%