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Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2013
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Sep. 30, 2013
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| Accrued liabilities | ||||||
| Visa Europe put option | $ 145 | [1] | $ 145 | [1] | ||
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Fair Value, Measurements, Recurring
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| Accrued liabilities | ||||||
| Visa Europe put option | 145 | 145 | ||||
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Level 1 | Fair Value, Measurements, Recurring
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| Prepaid and other current assets: | ||||||
| Fair value, total assets | 2,879 | 2,920 | ||||
| Accrued liabilities | ||||||
| Fair value, total liabilities | 0 | 0 | ||||
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Level 2 | Fair Value, Measurements, Recurring
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| Prepaid and other current assets: | ||||||
| Fair value, total assets | 3,199 | 3,047 | ||||
| Accrued liabilities | ||||||
| Fair value, total liabilities | 13 | 15 | ||||
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Level 3 | Fair Value, Measurements, Recurring
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| Prepaid and other current assets: | ||||||
| Fair value, total assets | 7 | 7 | ||||
| Accrued liabilities | ||||||
| Fair value, total liabilities | 145 | 145 | ||||
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Visa Europe put option | Level 3 | Fair Value, Measurements, Recurring
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| Accrued liabilities | ||||||
| Visa Europe put option | 145 | 145 | ||||
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Foreign exchange derivative instruments | Level 2 | Fair Value, Measurements, Recurring
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| Accrued liabilities | ||||||
| Foreign exchange derivative instruments | 13 | 15 | ||||
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Money market funds | Level 1 | Fair Value, Measurements, Recurring
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| Cash equivalents and restricted cash: | ||||||
| Cash equivalents and restricted cash: | 998 | 1,071 | ||||
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Commercial paper | Level 2 | Fair Value, Measurements, Recurring
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| Cash equivalents and restricted cash: | ||||||
| Cash equivalents and restricted cash: | 44 | 51 | ||||
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Equity securities | Level 1 | Fair Value, Measurements, Recurring
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| Investment securities: | ||||||
| Trading securities | 89 | 75 | ||||
| Available-for-sale securities | 122 | 101 | ||||
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U.S. government-sponsored debt securities | Level 2 | Fair Value, Measurements, Recurring
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| Investment securities: | ||||||
| Available-for-sale securities | 2,743 | 2,704 | ||||
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U.S. Treasury securities | Level 1 | Fair Value, Measurements, Recurring
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| Investment securities: | ||||||
| Available-for-sale securities | 1,670 | 1,673 | ||||
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Corporate Debt Securities | Level 2 | Fair Value, Measurements, Recurring
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| Investment securities: | ||||||
| Available-for-sale securities | 378 | 269 | ||||
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Auction rate securities | Level 3 | Fair Value, Measurements, Recurring
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| Investment securities: | ||||||
| Available-for-sale securities | 7 | 7 | ||||
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Foreign exchange derivative instruments | Level 2 | Fair Value, Measurements, Recurring
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| Prepaid and other current assets: | ||||||
| Prepaid and other current assets: | $ 34 | $ 23 | ||||
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