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Stockholders' Equity - Additional Information (Detail) (USD $) | 3 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Jan. 28, 2015 | Oct. 31, 2014
Stockholders Equity Note [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 5,000,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock Repurchase Remaining Authorized Amount | 4,900,000,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |
Dividends, Cash | $ 297,000,000 us-gaap_DividendsCash |  |
Subsequent Event |  |  |
Stockholders Equity Note [Line Items] |  |  |
Dividends Payable, Amount Per Share (in USD per Share) |  | 0.48 us-gaap_DividendsPayableAmountPerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Class A common stock | Subsequent Event |  |  |
Stockholders Equity Note [Line Items] |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 4 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 3: 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 Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Details
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- Details
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