v3.24.0.1
Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense
The following table summarizes total stock-based compensation expense (in millions):

Year Ended December 31,
202120222023
Operations and support$49 $63 $68 
Product development545 548 694 
Sales and marketing100 114 130 
General and administrative205 205 228 
Stock-based compensation expense$899 $930 $1,120 
Schedule of Fair Value Assumptions of Options Awarded
The fair value of each stock option award is estimated on the date of grant using the Black-Scholes option-pricing model using the range of assumptions in the following table:

Year Ended December 31,
202120222023
Expected term (years)
8.0
 6.1
1.4 - 6.1
Risk-free interest rate
1.1% - 1.5%
0.3% - 2.2%
3.6% - 5.0%
Expected volatility
44.2% - 44.9%
48.6% - 58.4%
51.3% - 54.4%
Expected dividend yield— — — 
Schedule of Stock Option Activity
A summary of stock option and RSU activity under the Plans was as follows (in millions, except per share amounts):

Outstanding
Stock Options
Outstanding
Restricted Stock Units
 Shares
Available for
Grant		Number of
Shares		Weighted-
Average
Exercise
Price		Number of
Shares		Weighted-
Average
Grant
Date Fair
Value
Balances as of December 31, 202181 24 $19.69 37 $61.22 
Granted
(13)1 161.70 12 135.09 
Increase in shares available for grant
32 — — — — 
Exercised/Vested 5 (3)14.32 (12)83.12 
Canceled3 — 95.93 (3)101.58 
Balances as of December 31, 2022108 22 23.41 34 77.07 
Granted
(13)1 115.15 12 122.84 
Increase in shares available for grant32 — — — — 
Exercised/Vested5 (16)5.37 (14)93.25 
Canceled2 — 98.60 (2)120.36 
Balances as of December 31, 2023134 7 $71.76 30 $85.35 
 Number of
Shares		Weighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual
Life (years)		Aggregate
Intrinsic
Value
Options outstanding as of December 31, 202222 $23.41 2.78$1,432 
Options exercisable as of December 31, 202220 17.01 2.271,380 
Options outstanding as of December 31, 20237 71.76 5.77500 
Options exercisable as of December 31, 20236 60.89 5.11448 
Schedule of RSU Activity
A summary of stock option and RSU activity under the Plans was as follows (in millions, except per share amounts):

Outstanding
Stock Options
Outstanding
Restricted Stock Units
 Shares
Available for
Grant		Number of
Shares		Weighted-
Average
Exercise
Price		Number of
Shares		Weighted-
Average
Grant
Date Fair
Value
Balances as of December 31, 202181 24 $19.69 37 $61.22 
Granted
(13)1 161.70 12 135.09 
Increase in shares available for grant
32 — — — — 
Exercised/Vested 5 (3)14.32 (12)83.12 
Canceled3 — 95.93 (3)101.58 
Balances as of December 31, 2022108 22 23.41 34 77.07 
Granted
(13)1 115.15 12 122.84 
Increase in shares available for grant32 — — — — 
Exercised/Vested5 (16)5.37 (14)93.25 
Canceled2 — 98.60 (2)120.36 
Balances as of December 31, 2023134 7 $71.76 30 $85.35 
 Number of
Shares		Weighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual
Life (years)		Aggregate
Intrinsic
Value
Options outstanding as of December 31, 202222 $23.41 2.78$1,432 
Options exercisable as of December 31, 202220 17.01 2.271,380 
Options outstanding as of December 31, 20237 71.76 5.77500 
Options exercisable as of December 31, 20236 60.89 5.11448 
Schedule of Transactions under Employee Stock Purchase Plan
The following table summarizes transactions under the Company’s ESPP (in millions except per share amounts):

Year Ended December 31,
20222023
Shares issued
0.5 0.7 
Weighted-average price per share
$95.90 $88.81 
Cash proceeds
$48 $64