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Stock-based Compensation (Summary Of Stock Option Activities) (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Schedule of Share-based Compensation Arrangements [Line Items]    
Stock options, shares outstanding at January 1, 2019 5,170  
Stock options, shares granted 573  
Stock options, shares exercised (2,118)  
Stock options, shares forfeited or expired (123)  
Stock options, shares outstanding at December 31, 2019 3,502 5,170
Stock options, shares vested or expected to vest at December 31, 2019 3,464  
Stock options, shares exercisable at December 31, 2019 2,257  
Stock options weighted-average exercise price, outstanding at January 1, 2019 $ 92.06  
Stock options weighted-average exercise price, granted 160.84  
Stock options weighted-average exercise price, exercised 73.63  
Stock options weighted-average exercise price, forfeited or expired 122.73  
Stock options weighted-average exercise price, outstanding at December 31, 2019 113.38 $ 92.06
Stock options weighted-average exercise price, vested or expected to vest at December 31, 2019 113.10  
Stock options weighted-average exercise price, options exercisable at December 31, 2019 $ 100.42  
Stock options weighted-average remaining contractual term in years, outstanding at January 1, 2019   5 years 4 months 24 days
Stock options weighted-average remaining contractual term in years, outstanding at December 31, 2019 6 years 1 month 6 days  
Stock options weighted-average remaining contractual term in years, vested or expected to vest at December 31, 2019 6 years 1 month 6 days  
Stock options weighted-average remaining contractual term in years, options exercisable at December 31, 2019 5 years  
Stock options aggregate intrinsic value, outstanding at January 1, 2019 $ 239  
Stock options aggregate intrinsic value, outstanding at December 31, 2019 236 $ 239
Stock options aggregate intrinsic value, vested or expected to vest at December 31, 2019 234  
Stock options aggregate intrinsic value, options exercisable at December 31, 2019 $ 181