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Stock-Based Compensation (Schedule Of Stock Option Activity) (Details)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Options, Outstanding, Beginning Balance | shares 1,074
Options, Granted | shares 1
Options, Exercised | shares (81)
Options, Forfeited, cancelled or expired | shares 0
Options, Outstanding, Ending Balance | shares 994
Options, Vested and expected to vest | shares 994
Options, Exercisable | shares 994
Weighted-average exercise price of options outstanding, beginning balance | $ / shares $ 30.85
Weighted-average exercise price of options granted during period | $ / shares 113.27
Weighted-average exercise price of options exercised during the period | $ / shares 31.88
Weighted-average exercise price of options forfeited, cancelled or expired during the period | $ / shares 0
Weighted-average exercise price of options outstanding, ending balance | $ / shares 30.85
Weighted-average exercise price of options vested and expected to vest | $ / shares 30.85
Weighted-average exercise price of options exercisable | $ / shares $ 30.85
Weighted-average remaining contractual term of options outstanding 3 years 7 months 20 days
Weighted-average remaining contractual term of options vested and expected to vest 3 years 7 months 20 days
Weighted-average remaining contractual term of options exercisable 3 years 7 months 20 days
Aggregate intrinsic value of options outstanding | $ $ 102
Aggregate intrinsic value of options vested and expected to vest | $ 102
Aggregate intrinsic value of options exercisable | $ $ 102