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Share-Based Compensation And Other Compensation Arrangements (Schedule Of Stock Unit Activity) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 2 years 5 months 8 days
Incentive Program Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Number of units, Outstanding at beginning of year 1,322,251
Number of units, Granted 259,791
Number of units, Dividends 22,571
Number of units, Forfeited (73,591)
Number of units, Distributed (625,997)
Number of units, Outstanding at end of year 905,025
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]  
Unrecognized compensation cost | $ $ 102
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 1 year 9 months 18 days
Other Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Number of units, Outstanding at beginning of year 984,235
Number of units, Granted 247,673
Number of units, Dividends 20,576
Number of units, Forfeited (121,344)
Number of units, Distributed (222,819)
Number of units, Outstanding at end of year 908,321
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]  
Unrecognized compensation cost | $ $ 132
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 2 years 7 months 6 days
Incentive Program Performance Based Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Number of units, Outstanding at beginning of year 1,268,667
Number of units, Granted 214,651
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease) 115,613 [1]
Number of units, Dividends 65,042
Number of units, Forfeited (60,755)
Number of units, Distributed (777,092)
Number of units, Outstanding at end of year 826,126
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]  
Unrecognized compensation cost | $ $ 91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 1 year 9 months 18 days
[1]
Represents net incremental number of units issued at vesting based on TSR for units granted in 2016