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Stock-Based Compensation and Stockholders' Equity - Share Repurchase Program (Narrative) (Details) - Common Stock - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2018
Nov. 08, 2018
2018 Share Repurchase Program          
Class of Stock [Line Items]          
Stock repurchase program, authorized amount         $ 150
Common stock shares acquired (in shares)   3,872,478 0    
Common stock acquired value   $ 141   $ 9  
Common stock acquired average price per share (in dollars per share)   $ 36.38      
2024 Share Repurchase Program          
Class of Stock [Line Items]          
Stock repurchase program, authorized amount $ 500 $ 500      
Common stock shares acquired (in shares) 0