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Stockholders' Equity - Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Detail) shares in Millions | Mar. 31, 2022 shares | Sep. 30, 2021 shares
--- | --- | ---
Schedule of Common Stock as Converted [Line Items] |  |
As-converted Class A Common Stock (in shares) | 2,129 | 2,161
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) | 6 | 7
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 | 6.2710 | 6.3210
As-converted Class A Common Stock (in shares) | 16 | 16
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 | 6.8290 | 6.834
As-converted Class A Common Stock (in shares) | 22 | 22
Class A common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 1,648 | 1,677
As-converted Class A Common Stock (in shares) | 1,648 | 1,677
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 | 1.6181 | 1.6228
As-converted Class A Common Stock (in shares) | 397 | 398
Class C common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 10 | 10
Common stock, conversion rate into Class A Common Stock | 4.0000 | 4.0000
As-converted Class A Common Stock (in shares) | 40 | 41

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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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