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Stockholders' Equity - Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Details)
shares in Millions
Dec. 31, 2024
shares
Sep. 30, 2024
shares
Schedule of Common Stock as Converted [Line Items]    
Preferred stock, shares outstanding (in shares) 5 5
As-converted Class A Common Stock (in shares) 1,972 1,983
Series A preferred stock    
Schedule of Common Stock as Converted [Line Items]    
Preferred stock, shares outstanding (in shares) 0 0
Preferred stock, conversion rate into Class A Common Stock 100.0000 100.0000
As-converted Class A Common Stock (in shares) 7 9
Series B preferred stock    
Schedule of Common Stock as Converted [Line Items]    
Preferred stock, shares outstanding (in shares) 2 2
Preferred stock, conversion rate into Class A Common Stock 0.9960 1.0030
As-converted Class A Common Stock (in shares) 2 2
Series C preferred stock    
Schedule of Common Stock as Converted [Line Items]    
Preferred stock, shares outstanding (in shares) 3 3
Preferred stock, conversion rate into Class A Common Stock 1.7830 1.7860
As-converted Class A Common Stock (in shares) 6 6
Class A common stock    
Schedule of Common Stock as Converted [Line Items]    
Common stock, shares outstanding (in shares) 1,726 1,733
Common stock, conversion rate into Class A Common Stock 0 0
As-converted Class A Common Stock (in shares) 1,726 1,733
Class B-1 common stock    
Schedule of Common Stock as Converted [Line Items]    
Common stock, shares outstanding (in shares) 5 5
Common stock, conversion rate into Class A Common Stock 1.5653 1.5653
As-converted Class A Common Stock (in shares) 8 8
Class B-2 common stock    
Schedule of Common Stock as Converted [Line Items]    
Common stock, shares outstanding (in shares) 120 120
Common stock, conversion rate into Class A Common Stock 1.5430 1.5430
As-converted Class A Common Stock (in shares) 186 186
Class C common stock    
Schedule of Common Stock as Converted [Line Items]    
Common stock, shares outstanding (in shares) 9 10
Common stock, conversion rate into Class A Common Stock 4.0000 4.0000
As-converted Class A Common Stock (in shares) 37 39