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Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Detail)
shares in Millions
12 Months Ended
Sep. 30, 2018
conversion_rate
shares
Sep. 30, 2017
shares
Sep. 30, 2016
Sep. 30, 2018
conversion_rate
shares
Class of Stock [Line Items]        
As-converted class A common stock [1]       2,291
Series B Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, shares outstanding 2 2   2
Preferred stock conversion rate 12.9550 13.077 [2] 13.952  
Shares Outstanding As Converted Basis [1] 32     32
Series C Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, shares outstanding 3 3   3
Preferred stock conversion rate 13.8880 13.948    
Shares Outstanding As Converted Basis [1] 44     44
Class A common stock        
Class of Stock [Line Items]        
Common stock, shares, outstanding 1,768 [3] 1,818   1,768 [3]
As-converted class A common stock [1],[3]       1,768
Class B common stock        
Class of Stock [Line Items]        
Common stock, shares, outstanding 245 245   245
Common stock, conversion rate | conversion_rate [2] 1.6298     1.6298
As-converted class A common stock [1]       400
Class C common stock        
Class of Stock [Line Items]        
Common stock, shares, outstanding 12 13   12
Common stock, conversion rate | conversion_rate 4.0000     4.0000
As-converted class A common stock [1]       47
[1] Figures in the table may not recalculate exactly due to rounding. As-converted class A common stock is calculated based on unrounded numbers.
[2] The class B to class A common stock conversion rate is presented on a rounded basis. Conversion calculations for dividend payments are based on a conversion rate rounded to the tenth decimal.
[3] Class A common stock shares outstanding reflect repurchases settled on or before September 30, 2018.