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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, 2020
Dec. 31, 2019
Schedule of Share-based Compensation Arrangements [Line Items]    
Stock options, shares outstanding at January 1, 2020 3,502  
Stock options, shares granted 558  
Stock options, shares exercised (1,402)  
Stock options, shares forfeited or expired (89)  
Stock options, shares outstanding at December 31, 2020 2,569 3,502
Stock options, shares vested or expected to vest at December 31, 2020 2,538  
Stock options, shares exercisable at December 31, 2020 1,547  
Stock options weighted-average exercise price, outstanding at January 1, 2020 $ 113.38  
Stock options weighted-average exercise price, granted 176.63  
Stock options weighted-average exercise price, exercised 100.41  
Stock options weighted-average exercise price, forfeited or expired 162.52  
Stock options weighted-average exercise price, outstanding at December 31, 2020 132.49 $ 113.38
Stock options weighted-average exercise price, vested or expected to vest at December 31, 2020 132.11  
Stock options weighted-average exercise price, options exercisable at December 31, 2020 $ 112.98  
Stock options weighted-average remaining contractual term in years, outstanding at January 1, 2020   6 years 1 month 6 days
Stock options weighted-average remaining contractual term in years, outstanding at December 31, 2020 6 years 4 months 24 days  
Stock options weighted-average remaining contractual term in years, vested or expected to vest at December 31, 2020 6 years 4 months 24 days  
Stock options weighted-average remaining contractual term in years, options exercisable at December 31, 2020 5 years 3 months 18 days  
Stock options aggregate intrinsic value, outstanding at January 1, 2020 $ 236  
Stock options aggregate intrinsic value, outstanding at December 31, 2020 195 $ 236
Stock options aggregate intrinsic value, vested or expected to vest at December 31, 2020 193  
Stock options aggregate intrinsic value, options exercisable at December 31, 2020 $ 147