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Stock-Based Compensation Plans (Summary of Restricted Share Activity) (Details)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Jan. 31, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested, beginning of period shares | shares 5,377
Granted shares | shares 1,517
Vested shares | shares (1,353)
Forfeited shares | shares (56)
Unvested, end of period shares | shares 5,485
Unvested, weighted-average grant date fair value, beginning of period ($ per share) | $ / shares $ 42.72
Granted, weighted-average grant date fair value ($ per share) | $ / shares 46.16
Vested, weighted-average grant date fair value ($ per share) | $ / shares 40.32
Forfeited, weighted-average grant date fair value ($ per share) | $ / shares 44.60
Unvested, weighted-average grant date fair value, end of period ($ per share) | $ / shares $ 44.24
Restricted Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted shares compensation cost related to unvested restricted share awards not yet recognized | $ $ 182.5
Weighted-average period over which compensation cost related to restricted shares is expected to be recognized (in years) 3 years 3 months 18 days