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Fair Value Measurements and Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	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

X

- 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)

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-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560

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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



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 14

-Article 7

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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

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Assumed Price to Earnings Differential at Time of Exercise

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Available-for-sale Securities, Gross Unrealized Gain Accumulated In Investments

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Incremental Price to Earnings Differential Compared to Estimate

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Incremental Probability of Exercise by Visa Europe

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Open Option Contracts Written, Exercise Probability

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Spot Price to Earnings

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