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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, 2017 conversion_rate shares | Sep. 30, 2016 shares | Sep. 30, 2017 conversion_rate shares | Mar. 19, 2015 conversion_rate
Class of Stock [Line Items] |  |  |  |  |  |  |
As-converted class A common stock | [1] |  |  |  | 2,350 |  |
Series B Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 2 |  | 2 | 2 |  |
Preferred stock series B conversion rate |  | 13.0770 | [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 series B conversion rate |  | 13.9480 |  | 13.952 |  |  |
Shares Outstanding As Converted Basis | [1] | 44 |  |  | 44 |  |
Class A common stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares, outstanding |  | 1,818 | [3] | 1,871 | 1,818 | [3] |
As-converted class A common stock | [1],[3] |  |  |  | 1,818 |  |
Class B common stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares, outstanding |  | 245 |  | 245 | 245 |  |
Common stock, conversion rate | conversion_rate | [2] | 1.6483 |  |  | 1.6483 |  | 1.6483
As-converted class A common stock | [1] |  |  |  | 405 |  |
Class C common stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares, outstanding |  | 13 |  | 17 | 13 |  |
Common stock, conversion rate | conversion_rate |  | 4.0000 |  |  | 4.0000 |  | 4.0
As-converted class A common stock | [1] |  |  |  | 51 |  |
[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, 2017.

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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