Earnings Per Share (Schedule Of Weighted Average Number Of Shares Outstanding Excluded From The Computation Of Diluted Earnings Per Share) (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computation of diluted earnings		1.2		1.8
Performance Awards | Antidilutive or Performance Condition not met
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computation of diluted earnings	2.8	5.5	2.7	6.1
Performance-Based Restricted Stock Units (PBRSUs) | Antidilutive or Performance Condition not met
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computation of diluted earnings	0.8	1.4	0.8	1.4
Restricted Stock Units (RSUs) | Antidilutive or Performance Condition not met
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computation of diluted earnings			0.7
Share-based Payment Arrangement, Option | Antidilutive or Performance Condition not met
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computation of diluted earnings	0.3		0.3