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Shareholders' Equity - Restricted shares vesting (Details) - Officers and other key employees
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 01, 2020
USD ($)
$ / shares
shares
Restricted share awards  
Shareholders Equity  
Number of Shares 251,924
Unrecognized compensation expense related to unvested share-based restricted stock awards and the unvested restricted share units (in dollars) | $ $ 8
Weighted average remaining life of the outstanding awards 1 year
Restricted share awards, Vesting in April 2020  
Shareholders Equity  
Number of Shares 114,003
Average Market Price on Date of Grant (in dollars per share) | $ / shares $ 58
Restricted share awards, Vesting in April 2021  
Shareholders Equity  
Number of Shares 83,248
Average Market Price on Date of Grant (in dollars per share) | $ / shares $ 76
Restricted share awards, Vesting based on service, Vesting in April 2022  
Shareholders Equity  
Number of Shares 54,673
Average Market Price on Date of Grant (in dollars per share) | $ / shares $ 75
Restricted share award, Vesting based on performance, Vesting in April 2022  
Shareholders Equity  
Earned but not issued (in shares) 40,000
Average Market Price on Date of Grant (in dollars per share) | $ / shares $ 76