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Share Repurchases in the Open Market (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Oct. 31, 2014
Stockholders' Equity Note [Abstract] |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 5,000,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock Repurchase Remaining Authorized Amount | 4,900,000,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |
Shares repurchased in the open market | 3 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | [1] |
Average repurchase price per share (2) | $ 259.52 us-gaap_TreasuryStockAcquiredAverageCostPerShare | [2] |
Total cost | $ 803,000,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |
[1] | All shares repurchased in the open market have been retired and constitute authorized but unissued shares.
[2] | Figures in the table may not recalculate exactly due to rounding. Average repurchase price per share is calculated based on unrounded numbers.

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- Definition Number of shares that have been repurchased and retired during the period. + 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + 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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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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