Earnings Per Share (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019 item shares	Dec. 31, 2018 shares	Dec. 31, 2017 shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Number of active share-based compensation plans | item	2
Potentially dilutive common shares	42,811	43,194	23,919
Stock-Settled Stock Appreciation Rights (SSARs) [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Potentially dilutive common shares	32,091	29,301	14,300
Restricted Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Potentially dilutive common shares	10,720	13,893	9,619