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Stockholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands
1 Months Ended 2 Months Ended 3 Months Ended
Feb. 28, 2021
Jan. 31, 2021
Feb. 28, 2021
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Class of Stock [Line Items]            
Repurchased of common stock       $ 122,000,000 $ 446,000,000  
Share-based compensation       $ 24,000,000 $ 12,000,000  
Common Stock            
Class of Stock [Line Items]            
Common stock authorized           $ 500,000,000
Repurchased of common stock (in shares)   577   1,000 3,000  
Repurchased of common stock $ 122,000,000     $ 6,000,000    
Average cost (USD per share)     $ 211.65