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Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | ---
Investment securities: |  |
Trading | $ 82 | $ 71
Accrued liabilities |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 |
Level 1 | Fair Value, Measurements, Recurring |  |
Prepaid and other current assets: |  |
Fair value, total assets | 7,517 | 6,839
Accrued liabilities |  |
Fair value, total liabilities | 0 | 0
Level 2 | Fair Value, Measurements, Recurring |  |
Prepaid and other current assets: |  |
Fair value, total assets | 4,891 | 5,200
Accrued liabilities |  |
Fair value, total liabilities | 84 | 136
Foreign exchange derivative instruments | Level 2 | Fair Value, Measurements, Recurring |  |
Accrued liabilities |  |
Foreign exchange derivative instruments | 76 | 116
Other liabilities | 8 | 20
Money market funds | Level 1 | Fair Value, Measurements, Recurring |  |
Cash equivalents and restricted cash: |  |
Cash equivalents and restricted cash: | 4,819 | 4,537
Equity securities | Level 1 | Fair Value, Measurements, Recurring |  |
Investment securities: |  |
Trading | 82 | 71
Available-for-sale securities | 62 | 53
U.S. Treasury securities | Level 1 | Fair Value, Measurements, Recurring |  |
Investment securities: |  |
Available-for-sale securities | 2,554 | 2,178
U.S. government-sponsored debt securities | Level 2 | Fair Value, Measurements, Recurring |  |
Cash equivalents and restricted cash: |  |
Cash equivalents and restricted cash: | 0 | 196
Investment securities: |  |
Available-for-sale securities | 4,671 | 4,699
Corporate debt securities | Level 2 | Fair Value, Measurements, Recurring |  |
Investment securities: |  |
Available-for-sale securities | 130 | 249
Foreign exchange derivative instruments | Level 2 | Fair Value, Measurements, Recurring |  |
Prepaid and other current assets: |  |
Prepaid and other current assets: | 88 | 50
Other assets | $ 2 | $ 6

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