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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2024
Equity [Abstract]  
Stock-Based Compensation Expense Stock-based compensation expense is as follows (in millions):
Three Months Ended
March 31,
20232024
Cost of sales$165 $174 
Fulfillment603 636 
Technology and infrastructure2,574 2,772 
Sales and marketing993 932 
General and administrative413 447 
Total stock-based compensation expense$4,748 $4,961 
Restricted Stock Unit Activity
The following table summarizes our restricted stock unit activity for the three months ended March 31, 2024 (in millions):
Number of UnitsWeighted-Average
Grant-Date
Fair Value
Outstanding as of December 31, 2023405.8 $125 
Units granted10.7 166 
Units vested(20.0)140 
Units forfeited(11.6)126 
Outstanding as of March 31, 2024384.9 126 
Scheduled Vesting for Outstanding Restricted Stock Units
Scheduled vesting for outstanding restricted stock units as of March 31, 2024, is as follows (in millions):
 Nine Months Ended December 31,Year Ended December 31,  
 20242025202620272028ThereafterTotal
Scheduled vesting — restricted stock units195.0 122.0 50.1 14.0 2.1 1.7 384.9 
Changes in Stockholders' Equity
The following table shows changes in stockholders’ equity (in millions):
Three Months Ended
March 31,
20232024
Total beginning stockholders’ equity$146,043 $201,875 
Beginning and ending common stock108 109 
Beginning and ending treasury stock(7,837)(7,837)
Beginning additional paid-in capital75,066 99,025 
Stock-based compensation and issuance of employee benefit plan stock4,797 4,913 
Ending additional paid-in capital79,863 103,938 
Beginning accumulated other comprehensive income (loss)(4,487)(3,040)
Other comprehensive income (loss)514 (558)
Ending accumulated other comprehensive income (loss)(3,973)(3,598)
Beginning retained earnings83,193 113,618 
Net income3,172 10,431 
Ending retained earnings86,365 124,049 
Total ending stockholders’ equity$154,526 $216,661