Earnings Per Share And Shareholders' Equity (Schedule of Company's Repurchase Program) (Details) - March 2018 Repurchase Program [Member] - USD ($) $ in Millions	Oct. 31, 2020	May 05, 2018
Amount Authorized		$ 250
Remaining authorized repurchase amount	$ 79

Amount remaining of a stock repurchase plan authorized.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant