Earnings (Loss) Per Share (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	1,015,000	620,000	980,000	730,000
Antidilutive securities excluded from computation of earnings (in shares)	4,000	9,000	3,000	9,000
Treasury stock, shares, acquired (in shares)			377,615	435,376
Purchase of treasury stock			$ 18	$ 18