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Fair Value Measurements and Investments (Tables) | 3 Months Ended
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Dec. 31, 2014
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | Assets and Liabilities Measured at Fair Value on a Recurring Basis
| Fair Value Measurements Using Inputs Considered as
| Level 1 |  | Level 2 |  | Level 3
| December 31, 2014 |  | September 30, 2014 |  | December 31, 2014 |  | September 30, 2014 |  | December 31, 2014 |  | September 30, 2014
| (in millions)
Assets |  |  |  |  |  |  |  |  |  |  |
Cash equivalents and restricted cash: |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 2,307 |  |  | $ | 2,277 |  |  |  |  |  |  |  |  |
Commercial paper |  |  |  |  | $ | 45 |  |  | $ | 37 |  |  |  |  |
Investment securities, trading: |  |  |  |  |  |  |  |  |  |  |
Equity securities | 78 |  |  | 69 |  |  |  |  |  |  |  |  |
Investment securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |
U.S. government-sponsored debt securities |  |  |  |  | 2,206 |  |  | 2,162 |  |  |  |  |
U.S. Treasury securities | 2,627 |  |  | 2,176 |  |  |  |  |  |  |  |  |
Equity securities | 25 |  |  | 58 |  |  |  |  |  |  |  |  |
Corporate debt securities |  |  |  |  | 580 |  |  | 522 |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  |  | $ | 7 |  |  | $ | 7 |
Prepaid and other current assets: |  |  |  |  |  |  |  |  |  |  |
Foreign exchange derivative instruments |  |  |  |  | 86 |  |  | 40 |  |  |  |  |
Total | $ | 5,037 |  |  | $ | 4,580 |  |  | $ | 2,917 |  |  | $ | 2,761 |  |  | $ | 7 |  |  | $ | 7 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities: |  |  |  |  |  |  |  |  |  |  |
Visa Europe put option |  |  |  |  |  |  |  |  | $ | 145 |  |  | $ | 145 |
Foreign exchange derivative instruments |  |  |  |  | $ | 7 |  |  | $ | 6 |  |  |  |  |
Total | $ | — |  |  | $ | — |  |  | $ | 7 |  |  | $ | 6 |  |  | $ | 145 |  |  | $ | 145 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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