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Fair Value Measurements and Investments (Tables) | 12 Months Ended
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Sep. 30, 2017
Fair Value Measurements and Investments [Abstract] |
Fair Value, Assets and Liabilities Measured on Recurring Basis | Assets and Liabilities Measured at Fair Value on a Recurring Basis
| Fair Value Measurements at September 30 Using Inputs Considered as
| Level 1 |  | Level 2
| September 30, 2017 |  | September 30, 2016 |  | September 30, 2017 |  | September 30, 2016
| (in millions)
Assets |  |  |  |  |  |  |
Cash equivalents and restricted cash: |  |  |  |  |  |  |
Money market funds | $ | 5,935 |  |  | $ | 4,537 |  |  |  |  |
U.S. government-sponsored debt securities |  |  |  |  | $ | 2,870 |  |  | $ | 196 |
Investment securities, trading: |  |  |  |  |  |  |
Equity securities | $ | 82 |  |  | $ | 71 |  |  |  |  |
Investment securities, available-for-sale: |  |  |  |  |  |  |
U.S. government-sponsored debt securities |  |  |  |  | 3,663 |  |  | 4,699 |
U.S. Treasury securities | 1,621 |  |  | 2,178 |  |  |  |  |
Equity securities | 124 |  |  | 53 |  |  |  |  |
Corporate debt securities |  |  |  |  | — |  |  | 249 |
Prepaid and other current assets: |  |  |  |  |  |  |
Foreign exchange derivative instruments |  |  |  |  | 18 |  |  | 50 |
Other Assets: |  |  |  |  |  |  |
Foreign exchange derivative instruments |  |  |  |  |  |  |  | 6 |
Total | $ | 7,762 |  |  | $ | 6,839 |  |  | $ | 6,551 |  |  | $ | 5,200 |
Liabilities |  |  |  |  |  |  |
Accrued liabilities: |  |  |  |  |  |  |
Foreign exchange derivative instruments |  |  |  |  | $ | 98 |  |  | $ | 116 |
Other liabilities: |  |  |  |  |  |  |
Foreign exchange derivative instruments |  |  |  |  | — |  |  | 20 |
Total | $ | — |  |  | $ | — |  |  | $ | 98 |  |  | $ | 136 |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The following table presents the carrying amount and estimated fair value of the Company’s debt in order of maturity:
| September 30, 2017 |  | September 30, 2016
| Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
| (in millions)
1.20% Senior Notes due December 2017 | $ | 1,749 |  |  | $ | 1,751 |  |  | $ | 1,746 |  |  | $ | 1,754 |
2.20% Senior Notes due December 2020 | 2,990 |  |  | 3,031 |  |  | 2,988 |  |  | 3,077 |
2.15% Senior Notes due September 2022 | 993 |  |  | 997 |  |  | — |  |  | — |
2.80% Senior Notes due December 2022 | 2,240 |  |  | 2,301 |  |  | 2,238 |  |  | 2,359 |
3.15% Senior Notes due December 2025 | 3,967 |  |  | 4,098 |  |  | 3,964 |  |  | 4,225 |
2.75% Senior Notes due September 2027 | 740 |  |  | 737 |  |  | — |  |  | — |
4.15% Senior Notes due December 2035 | 1,485 |  |  | 1,637 |  |  | 1,485 |  |  | 1,698 |
4.30% Senior Notes due December 2045 | 3,463 |  |  | 3,873 |  |  | 3,461 |  |  | 4,045 |
3.65% Senior Notes due September 2047 | 740 |  |  | 746 |  |  | — |  |  | — |
Total | $ | 18,367 |  |  | $ | 19,171 |  |  | $ | 15,882 |  |  | $ | 17,158 |
Available-for-sale Investment Securities | The amortized cost, unrealized gains and losses and fair value of available-for-sale investment securities are as follows:
| September 30, 2017 |  | September 30, 2016
| Amortized Cost |  | Gross Unrealized |  | Fair Value |  | Amortized Cost |  | Gross Unrealized |  | Fair Value
| Gains |  | Losses |  | Gains |  | Losses |
| (in millions)
U.S. government-sponsored debt securities | $ | 3,664 |  |  | $ | 1 |  |  | $ | (2 | ) |  | $ | 3,663 |  |  | $ | 4,693 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 4,699 |
U.S. Treasury securities | 1,623 |  |  | — |  |  | (2 | ) |  | 1,621 |  |  | 2,176 |  |  | 3 |  |  | — |  |  | 2,179 |
Equity securities | 5 |  |  | 119 |  |  | — |  |  | 124 |  |  | 7 |  |  | 46 |  |  | — |  |  | 53 |
Corporate debt securities | — |  |  | — |  |  | — |  |  | — |  |  | 248 |  |  | — |  |  | — |  |  | 248 |
Auction rate securities | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total | $ | 5,292 |  |  | $ | 120 |  |  | $ | (4 | ) |  | $ | 5,408 |  |  | $ | 7,124 |  |  | $ | 55 |  |  | $ | — |  |  | $ | 7,179 |
Less: current portion of available-for-sale investment securities |  |  |  |  |  |  | $ | (3,482 | ) |  |  |  |  |  |  |  | $ | (3,248 | )
Long-term available-for-sale investment securities |  |  |  |  |  |  | $ | 1,926 |  |  |  |  |  |  |  |  | $ | 3,931 |
Available for Sale Investments Classified by Contractual Maturity Date |
| Amortized Cost |  | Fair Value
| (in millions)
September 30, 2017: |  |  |
Due within one year | $ | 3,360 |  |  | $ | 3,358 |
Due after 1 year through 5 years | 1,927 |  |  | 1,926 |
Due after 5 years through 10 years | — |  |  | — |
Due after 10 years | — |  |  | — |
Total | $ | 5,287 |  |  | $ | 5,284 |
Investment Income | Investment income is recorded as non-operating income in the Company's consolidated statements of operations and consisted of the following:
| For the Years Ended September 30,
| 2017 |  | 2016 |  | 2015
| (in millions)
Interest and dividend income on cash and investments | $ | 92 |  |  | $ | 75 |  |  | $ | 31 |
Gain on other investments | 6 |  |  | 5 |  |  | 3 |
Investment securities, trading: |  |  |  |  |
Unrealized gains (losses), net | 6 |  |  | 3 |  |  | (6 | )
Realized gains, net | 2 |  |  | — |  |  | 2 |
Investment securities, available-for-sale: |  |  |  |  |
Realized (losses) gains, net | (1 | ) |  | 3 |  |  | 21 |
Other-than-temporary impairment on investments | — |  |  | (4 | ) |  | (5 | )
Investment income | $ | 105 |  |  | $ | 82 |  |  | $ | 46 |

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