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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Jan. 31, 2017
Stockholders Equity Note [Line Items] |  |
Stock Repurchase Remaining Authorized Amount | $ 3,900 |
Dividends, Cash | $ 399 |
Subsequent Event | Class A common stock |  |
Stockholders Equity Note [Line Items] |  |
Dividends Payable, Amount Per Share |  | $ 0.165

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- Definition Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: 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=6367179&loc=d3e4304-108586 + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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