Earnings Per Share (Narrative) (Details) $ in Millions	Sep. 30, 2020 USD ($)
Earnings Per Share [Abstract]
Share repurchase, remaining availability	$ 191

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