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Stockholders' Equity - Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Detail) shares in Millions | Dec. 31, 2016 shares | Sep. 30, 2016 shares
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Schedule of Common Stock as Converted [Line Items] |  |  |  |
As-converted Class A Common Stock |  | 2,400 |  |
U.K.& I preferred stock |  |  |  |
Schedule of Common Stock as Converted [Line Items] |  |  |  |
Preferred stock, shares outstanding |  | 2 |  | 2
Preferred stock, conversion rate into Class A Common StockRatio |  | 13.9520 |  |
As-converted Class A Common Stock | [1] | 35 |  |
Europe preferred stock |  |  |  |
Schedule of Common Stock as Converted [Line Items] |  |  |  |
Preferred stock, shares outstanding |  | 3 |  | 3
Preferred stock, conversion rate into Class A Common StockRatio |  | 13.9520 |  |
As-converted Class A Common Stock | [1] | 44 |  |
Class A common stock |  |  |  |
Schedule of Common Stock as Converted [Line Items] |  |  |  |
Common stock, shares outstanding |  | 1,854 | [2] | 1,871
As-converted Class A Common Stock | [1],[2] | 1,854 |  |
Class B common stock |  |  |  |
Schedule of Common Stock as Converted [Line Items] |  |  |  |
Common stock, shares outstanding |  | 245 |  | 245
Common stock, conversion rate into Class A Common Stock | [3] | 1.6483 |  |
As-converted Class A Common Stock | [1] | 405 |  |
Class C common stock |  |  |  |
Schedule of Common Stock as Converted [Line Items] |  |  |  |
Common stock, shares outstanding |  | 16 |  | 17
Common stock, conversion rate into Class A Common Stock |  | 4 |  |
As-converted Class A Common Stock | [1] | 62 |  |
[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] | Class A common stock shares outstanding exclude repurchases traded but not yet settled on or before December 31, 2016.
[3] | 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.

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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=6928386&loc=d3e21463-112644 + Details
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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://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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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