Employee Benefit Plans (Marketable Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Retirement Benefits [Abstract]
Marketable securities held in trusts	$ 774	$ 965

Amount of investment in marketable security, classified as current.

No definition available.

Name:	us-gaap_MarketableSecuritiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant