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Stock-Based Plans
3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Stock-Based Plans STOCK-BASED PLANS
STOCK-BASED COMPENSATION EXPENSE

Stock-based compensation expense for our equity incentive plans are measured and recognized based on estimated fair values at time of grant.

The impact on our results of operations of recording stock-based compensation expense under our equity incentive plans for the three months ended March 31, 2021 and 2020 was as follows:
Three Months Ended March 31,
 20212020
(In millions)
Customer support and operations$72 $52 
Sales and marketing48 39 
Technology and development139 113 
General and administrative119 87 
Total stock-based compensation expense$378 $291 
Capitalized as part of internal use software and website development costs$16 $10