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Stockholders' Equity - Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Detail) shares in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 shares | Sep. 30, 2019 shares
Schedule of Common Stock as Converted [Line Items] |  |
As-converted Class A Common Stock (in shares) | 2,210 | 2,237
U.K.& I 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 | 12.936 | 12.936
As-converted Class A Common Stock (in shares) | 32 | 32
Europe 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 | 13.884 | 13.884
As-converted Class A Common Stock (in shares) | 44 | 44
Class A common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 1,693 | 1,718
As-converted Class A Common Stock (in shares) | 1,693 | 1,718
Class B common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 245 | 245
Common stock, conversion rate into Class A Common Stock | 1.6228 | 1.6228
As-converted Class A Common Stock (in shares) | 398 | 398
Class C common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 11 | 11
Common stock, conversion rate into Class A Common Stock | 4.0000 | 4.0000
As-converted Class A Common Stock (in shares) | 43 | 45

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