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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary Of Stock Option Activity Under All Stock Plans
Option activity during fiscal 2019 under all the stock plans was as follows (in millions, except per share amounts):
 Stock Options Outstanding
 Number
Outstanding		Weighted Average
Exercise Price Per
Share
Balance at December 31, 20186.2  $200.79  
Options granted0.6  $523.30  
Options exercised(1.3) $159.46  
Options forfeited/expired(0.1) $381.82  
Balance at December 31, 20195.4  $246.64  
Summary Of Significant Ranges Of Outstanding And Exercisable Options
The following table summarizes significant ranges of outstanding and exercisable options as of December 31, 2019 (number of shares and aggregate intrinsic value in millions):
 Options OutstandingOptions Exercisable
Range of
Exercise Prices		Number
of Shares		Weighted
Average
Remaining
Contractual Life		Weighted
Average
Exercise Price
Per Share		Aggregate
Intrinsic
Value (1)		Number
of Shares		Weighted
Average
Remaining
Contractual Life		Weighted
Average
Exercise Price
Per Share		Aggregate
Intrinsic
Value (1)
$86.88-$148.03
1.1  2.8$127.46  1.1  $127.46  
$150.50-$172.44
1.4  3.6$166.28  1.4  $166.29  
$172.76-$231.00
1.2  5.1$194.42  1.2  $193.89  
$231.11-$505.36
1.1  8.1$376.53  0.5  $334.67  
$508.19-$585.57
0.6  9.0$536.41  0.1  $531.66  
Total5.4  5.3$246.64  $1,844.4  4.3  4.4$195.76  $1,702.4  

(1)The aggregate intrinsic value represents the total pre-tax intrinsic value, based on the Company’s closing stock price of $591.15 at December 31, 2019, which would have been received by the option holders had all in-the-money option holders exercised their options as of that date.
Summary of RSU Activity
RSU activity for the year ended December 31, 2019, was as follows (in millions, except per share amounts):
 
Shares		Weighted Average
Grant Date Fair Value
Unvested balance at December 31, 20182.0  $295.70  
Granted0.8  541.36
Vested(0.8) 258.87
Forfeited(0.1) 382.52
Unvested balance at December 31, 20191.9  410.09
Summary Of Share-Based Compensation Expense
The following table summarizes share-based compensation expense (in millions):
 Years Ended December 31,
 201920182017
Cost of sales—products$46.6  $36.4  $28.1  
Cost of sales—services20.4  16.8  14.0  
Total cost of sales67.0  53.2  42.1  
Selling, general and administrative169.5  133.2  111.8  
Research and development101.4  76.2  56.0  
Share-based compensation expense before income taxes337.9  262.6  209.9  
Income tax effect70.2  54.3  49.2  
Share-based compensation expense after income taxes$267.7  $208.3  $160.7  
Schedule Of Estimated Fair Values Of The Option Using Black-Scholes Option Pricing Model, Weighted Average Assumptions and Fair Value of RSUs The weighted-average estimated fair values of stock options, the rights to acquire stock under the ESPP, and RSUs, as well as the weighted average assumptions used in calculating the fair values of stock options and rights to acquire stock under the ESPP that were granted during the years ended December 31, 2019, 2018, and 2017, were as follows:
 Years Ended December 31,
STOCK OPTION PLANS201920182017
Risk-free interest rate2.0 %2.7 %1.8 %
Expected term (years)4.14.34.1
Volatility30 %33 %25 %
Fair value at grant date$142.53  $146.30  $67.03  
EMPLOYEE STOCK PURCHASE PLAN
Risk-free interest rate2.1 %2.1 %1.2 %
Expected term (years)1.21.31.2
Volatility29 %32 %28 %
Fair value at grant date$148.99  $135.84  $79.77  
RESTRICTED STOCK UNITS
Fair value at grant date$541.36  $431.11  $249.34