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Stockholders' Equity - Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Detail)
shares in Millions
Sep. 30, 2023
shares
Sep. 30, 2022
shares
Class of Stock [Line Items]    
As-converted Class A Common Stock (in shares) 2,047 2,103
Series A preferred stock    
Class of Stock [Line Items]    
Preferred stock, shares outstanding (in shares) 0 0
Preferred stock conversion rate 100.0000 100.0000
As-converted Class A Common Stock (in shares) 7 16
Series B preferred stock    
Class of Stock [Line Items]    
Preferred stock, shares outstanding (in shares) 2 2
Preferred stock conversion rate 2.9370 2.9710
As-converted Class A Common Stock (in shares) 7 7
Series C preferred stock    
Class of Stock [Line Items]    
Preferred stock, shares outstanding (in shares) 3 3
Preferred stock conversion rate 3.6290 3.6450
As-converted Class A Common Stock (in shares) 11 12
Class A common stock    
Class of Stock [Line Items]    
Common stock, shares, outstanding (in shares) 1,594 1,635
As-converted Class A Common Stock (in shares) 1,594 1,635
Class B common stock    
Class of Stock [Line Items]    
Common stock, shares, outstanding (in shares) 245 245
Common stock, conversion rate 1.5875 1.6059
As-converted Class A Common Stock (in shares) 390 394
Class C common stock    
Class of Stock [Line Items]    
Common stock, shares, outstanding (in shares) 10 10
Common stock, conversion rate 4.0000 4.0000
As-converted Class A Common Stock (in shares) 38 39