Commitments and Contingencies (Legal Matters Narrative) (Details) $ in Millions		1 Months Ended	12 Months Ended
	Sep. 09, 2019 defendant	Oct. 31, 2018 USD ($)	Dec. 31, 2020 USD ($) claim	Dec. 31, 2019 USD ($) claim	Mar. 31, 2020 lawsuit	Jan. 23, 2020 claim	Dec. 31, 2018 claim	Aug. 01, 2018 numberOfLawFirms
Loss Contingencies [Line Items]
Number of consolidated claims | lawsuit					3
Number of consolidated class action lawsuits						4
Number of law firms retained | numberOfLawFirms								2
Contributions to grantor trust | $		$ 120
Number of defendants | defendant	14
Cost for settlement and defense of asbestos claims, net of insurance recoveries and tax benefits | $			$ 35	$ 58
Asbestos Claims [Member]
Loss Contingencies [Line Items]
Number of pending asbestos claims			30,710	30,950			31,570
Number of new asbestos claims			2,910
Number of asbestos claims closed or moved to inactive docket			3,150