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Share-Based Compensation (Changes in Nonvested Options) (Details) - Restricted Stock Units [Member]
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended
Oct. 31, 2020
USD ($)
$ / shares
shares
Number of Shares  
Nonvested, Beginning Balance 936
Granted 416
Vested (120)
Performance adjustment (132)
Expired or cancelled (155) [1]
Nonvested, Ending Balance 945
Aggregate value | $ $ 36
Wtg. Avg. remaining contractual life (in years) 1 year 2 months 12 days
Weighted-Average Grant Date Fair Value per Share  
Nonvested, Beginning Balance | $ / shares $ 49.25
Granted | $ / shares 22.59
Vested | $ / shares 53.31
Cancelled | $ / shares 38.56 [1]
Nonvested, Ending Balance | $ / shares $ 37.78
[1] This represents adjustments made to performance-based RSU awards and reflect changes in estimates based upon our current performance against predefined financial targets.