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Fair Value Measurements and Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
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Mar. 31, 2014 | Sep. 30, 2013
Fair Value, Measurement Inputs, Disclosure [Line Items] |  |
Probability of exercise by Visa Europe | 40.00% |
P/E differential at the time of exercise | 1.9x |
P/E differential at the time of exercise, ratio | 190.00% |
Spot price to earnings | 20.8x |
Spot price to earnings, ratio | 2080.00% |
Incremental price to earnings differential compared to estimate | 1.7x |
Incremental price to earnings differential compared to estimate, ratio | 170.00% |
Incremental probability of exercise by Visa Europe | 5.00% |
Increase in put option value due to increase in probability of exercise | $ 18 |
Incremental assumed price to earnings differential at time of exercise | 1.0x |
Incremental P/E differential at time of exercise, ratio | 100.00% |
Increase in put option value due to increase in price to earnings differential | 84 |
Other than temporary impairment loss | 15 |
Available-for-sale securities, gross unrealized gains | 121 | 93
Available-for-sale securities, gross unrealized losses |  | 1
Fair Value, Measurements, Recurring |  |
Fair Value, Measurement Inputs, Disclosure [Line Items] |  |
Visa Europe put option | 145 | 145
Non Marketable Equity Investments |  |
Fair Value, Measurement Inputs, Disclosure [Line Items] |  |
Non-marketable equity investments | $ 32 | $ 30

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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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- Definition Fair value portion of liability related to investment contracts for example, but not limited to, guaranteed investment contract or annuities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6487514&loc=d3e32427-158581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 14 -Article 7 + Details
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- Definition Value of the other investment not readily marketable determined by management based upon fair value methods, including pricing of similar securities and valuation techniques, that was used to record the investment for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 820 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=29644083&loc=d3e45360-110995 + Details
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- Details
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