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Fair Value Measurements and Investments (Tables)
 12 Months Ended
Sep. 30, 2018
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
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Assets
 
 
 
 
 
 
 
Cash equivalents and restricted cash:
 
 
 
 
 
 
 
Money market funds
$
6,252

 
$
5,935

 
 
 
 
U.S. government-sponsored debt securities
 
 
 
 
$
1,048

 
$
2,870

Investment securities, trading:
 
 
 
 
 
 
 
Equity securities
98

 
82

 
 
 
 
Investment securities, available-for-sale:
 
 
 
 
 
 
 
U.S. government-sponsored debt securities
 
 
 
 
5,008

 
3,663

U.S. Treasury securities
2,508

 
1,621

 
 
 
 
Equity securities
15

 
124

 
 
 
 
Prepaid and other current assets:
 
 
 
 
 
 
 
Foreign exchange derivative instruments
 
 
 
 
78

 
18

Other assets:
 
 
 
 
 
 
 
Total
$
8,873

 
$
7,762

 
$
6,134

 
$
6,551

Liabilities
 
 
 
 
 
 
 
Accrued liabilities:
 
 
 
 
 
 
 
Foreign exchange derivative instruments
 
 
 
 
$
22

 
$
98

Total
$
—

 
$
—

 
$
22

 
$
98
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, 2018
 
September 30, 2017
 
Amortized
Cost
 
Gross Unrealized
 
Fair
Value
 
Amortized
Cost
 
Gross Unrealized
 
Fair
Value
 
Gains
 
Losses
 
Gains
 
Losses
 
 
(in millions)
U.S. government-sponsored debt securities
$
5,016

 
$
—

 
$
(8
)
 
$
5,008

 
$
3,664

 
$
1

 
$
(2
)
 
$
3,663

U.S. Treasury securities
2,516

 
—

 
(8
)
 
2,508

 
1,623

 
—

 
(2
)
 
1,621

Equity securities
4

 
11

 
—

 
15

 
5

 
119

 
—

 
124

Total
$
7,536

 
$
11

 
$
(16
)
 
$
7,531

 
$
5,292

 
$
120

 
$
(4
)
 
$
5,408

Less: current portion of available-for-sale investment securities
 
 
 
 
 
 
$
(3,449
)
 
 
 
 
 
 
 
$
(3,482
)
Long-term available-for-sale investment securities
 
 
 
 
 
 
$
4,082

 
 
 
 
 
 
 
$
1,926
Available for Sale Investments Classified by Contractual Maturity Date
 
Amortized Cost
 
Fair Value
 
(in millions)
September 30, 2018:
 
 
 
Due within one year
$
3,443

 
$
3,434

Due after 1 year through 5 years
4,089

 
4,082

Due after 5 years through 10 years
—

 
—

Due after 10 years
—

 
—

Total
$
7,532

 
$
7,516
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,
 
2018
 
2017
 
2016
 
(in millions)
Interest and dividend income on cash and investments
$
173

 
$
92

 
$
75

Gain on other investments
—

 
6

 
5

Investment securities, trading:
 
 
 
 
 
Unrealized gains, net
2

 
6

 
3

Realized gains, net
4

 
2

 
—

Investment securities, available-for-sale:
 
 
 
 
 
Realized gains (losses), net from sales
98

 
(1
)
 
3

Realized gains from donation
193

 
—

 
—

Other-than-temporary impairment on investments
—

 
—

 
(4
)
Investment income
$
470

 
$
105

 
$
82