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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
Mar. 31, 2016
Mar. 31, 2015
Performance Awards [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares excluded from the computation of diluted earnings 7.6 5.9
Performance-Based Restricted Stock Units (PBRSUs) [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares excluded from the computation of diluted earnings 1.9 2.3