Earnings or Loss per Share (Narrative) (Details) - shares shares in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Stock Options, SARs, and RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate number of shares excluded from computation of EPS (in shares)	61.1
Stock Options, SARs, RSUs and RSAs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate number of shares excluded from computation of EPS (in shares)		77.3	59.2
PSARs and PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate number of shares excluded from computation of EPS (in shares)	25.2	20.2	5.8