Fair Value Measurements and Investments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||||||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2011
Companhia Brasileira de Solucoes e Servicos [Member]
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Sep. 30, 2013
Earn out related to PlaySpan acquisition
Fair Value, Measurements, Recurring
Level 3
|
Sep. 30, 2012
Earn out related to PlaySpan acquisition
Fair Value, Measurements, Recurring
Level 3
|
Mar. 02, 2011
Earn out related to PlaySpan acquisition
Pay Span Inc
Fair Value, Measurements, Recurring
Level 3
|
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Investment [Line Items] | |||||||||||
Payment from litigation escrow account-Retrospective Responsibility Plan | $ (4,383) | $ (140) | $ (280) | ||||||||
Put option, fair value | 145 | [1] | 145 | [1] | 0 | 12 | |||||
Fair value of earn-put provision | 24 | ||||||||||
Non-marketable equity securities, recognized losses due to impairment | 15 | 2 | 0 | ||||||||
Non-marketable equity investments | 30 | 86 | |||||||||
Equity method investments reclassified as available-for-sale, carrying value | 12 | ||||||||||
Available-for-sale securities, previously classified as equity method investments, fair value | 99 | ||||||||||
Available-for-sale securities, previously classified as equity method investments, unrealized gains | 87 | ||||||||||
Trading assets, mutual fund investments related to various employee compensation plans | 75 | 66 | |||||||||
Long-term available-for-sale investment securities | 2,760 | 3,283 | |||||||||
Gain on other investments from the sale of equity interest in Visa Vale, pre-tax gain | $ 85 | ||||||||||
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