Earnings (Loss) Per Share (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	445,000	776,000	778,000	872,000
Antidilutive securities excluded from computation of earnings (in shares)	915,000	1,000	13,000
Treasury stock, shares, acquired (in shares)			435,376	365,695
Purchase of treasury stock			$ 18	$ 16