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Share-Based Compensation (Schedule Of Share-Based Compensation Expense Included In The Consolidated Statements Of Comprehensive Earnings) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share-based compensation expense $ 41 $ 20
G&A [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share-based compensation expense 20 $ 20
Restructuring and Transaction Costs [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Accelerated share-based compensation expense $ 21