Earnings (Loss) Per Share (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	952,000	445,000	967,000	778,000
Antidilutive securities excluded from computation of earnings (in shares)	1,000	915,000	3,000	13,000
Treasury stock, shares, acquired (in shares)			377,615	435,376
Purchase of treasury stock			$ 18	$ 18