Fair Value Measurements

Assets and Liabilities Measured at Fair Value on a Recurring Basis (in millions):



			Fair Value Measurements at Reporting Date Using
	Balance at September 30, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	$	8,756.3	$	8,756.3	$	—	$	—
Short-term investments:
Available-for-sale securities
Commercial paper	8.4		—		8.4		—
Corporate debt securities	91.8		—		91.8		—
Mortgage and other asset-backed securities	6.0		—		6.0		—
Total available-for-sale securities	106.2		—		106.2		—
Trading securities	75.3		75.3		—		—
Total short-term investments	181.5		75.3		106.2		—
Prepaid expenses and other current assets:
Derivative assets	24.5		1.2		23.3		—
Long-term investments:
Available-for-sale securities
Agency obligations	5.9		—		5.9		—
Corporate debt securities	114.5		—		114.5		—
Auction rate securities	5.9		—		—		5.9
Foreign government obligations	3.6		—		3.6		—
U.S. government treasury securities	108.1		108.1		—		—
State and local government obligations	4.8		—		4.8		—
Mortgage and other asset-backed securities	24.9		—		24.9		—
Total long-term investments	267.7		108.1		153.7		5.9
Other long-term assets:
Derivative assets	10.4		—		10.4		—
Total assets	$	9,240.4	$	8,940.9	$	293.6	$	5.9
Liabilities:
Accrued liabilities:
Derivative liabilities	$	6.5	$	0.4	$	6.1	$	—
Other long-term liabilities:
Derivative liabilities	43.5		—		43.5		—
Total liabilities	$	50.0	$	0.4	$	49.6	$	—



			Fair Value Measurements at Reporting Date Using
	Balance at Oct 1, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	$	2,462.3	$	2,462.3	$	—	$	—
Short-term investments:
Available-for-sale securities
Agency obligations	7.5		—		7.5		—
Commercial paper	2.0		—		2.0		—
Corporate debt securities	49.4		—		49.4		—
Foreign government obligations	7.1		—		7.1		—
U.S. government treasury securities	81.4		81.4		—		—
State and local government obligations	2.0		—		2.0		—
Certificates of deposit	2.3		—		2.3		—
Total available-for-sale securities	151.7		81.4		70.3		—
Trading securities	76.9		76.9		—		—
Total short-term investments	228.6		158.3		70.3		—
Prepaid expenses and other current assets:
Derivative assets	13.4		0.1		13.3		—
Long-term investments:
Available-for-sale securities
Agency obligations	21.8		—		21.8		—
Corporate debt securities	207.4		—		207.4		—
Auction rate securities	5.9		—		—		5.9
Foreign government obligations	17.1		—		17.1		—
U.S. government treasury securities	127.4		127.4		—		—
State and local government obligations	7.0		—		7.0		—
Mortgage and other asset-backed securities	155.7		—		155.7		—
Total long-term investments	542.3		127.4		409.0		5.9
Other long-term assets:
Derivative assets	24.4		—		24.4		—
Total assets	$	3,271.0	$	2,748.1	$	517.0	$	5.9
Liabilities:
Accrued liabilities:
Derivative liabilities	$	16.4	$	2.5	$	13.9	$	—
Other long-term liabilities:
Derivative liabilities	22.1		—		22.1		—
Total	$	38.5	$	2.5	$	36.0	$	—

There were no material transfers between levels and there was no significant activity within Level 3 instruments during the periods presented. The fair values of any financial instruments presented above exclude the impact of netting assets and liabilities when a legally enforceable master netting agreement exists.

Available-for-sale Securities

Long-term investments generally mature within 4 years. Proceeds from sales of available-for-sale securities were $459.0 million, $999.7 million, and $680.7 million for fiscal years 2018, 2017 and 2016, respectively. Realized gains and losses on sales and maturities of available-for-sale securities were not material for fiscal years 2018, 2017, and 2016. Gross unrealized holding gains and losses on available-for-sale securities were not material as of September 30, 2018 and October 1, 2017.

Trading Securities

Trading securities include equity mutual funds and exchange-traded funds. Our trading securities portfolio approximates a portion of our liability under our MDCP, a defined contribution plan. Our MDCP liability was $102.2 million and $105.9 million as of September 30, 2018 and October 1, 2017, respectively. The changes in net unrealized holding gains and losses in the trading securities portfolio included in earnings for fiscal years 2018, 2017 and 2016 were not material. Gross unrealized holding gains and losses on trading securities were not material as of September 30, 2018 and October 1, 2017.

Derivative Assets and Liabilities

Derivative assets and liabilities include foreign currency forward contracts, commodity futures contracts, collars and swaps, which are described further in Note 3, Derivative Financial Instruments.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

Assets and liabilities recognized or disclosed at fair value on a nonrecurring basis include items such as property, plant and equipment, goodwill and other intangible assets, equity and cost method investments, and other assets. These assets are measured at fair value if determined to be impaired. Impairment of property, plant, and equipment is included at Note 1, Summary of Significant Accounting Policies.

Other than the impairments discussed in Note 8, Other Intangible Assets and Goodwill, and the aforementioned fair value adjustments, there were no other material fair value adjustments during fiscal 2018 and 2017.

Fair Value of Other Financial Instruments

The estimated fair value of our long-term debt based on the quoted market price (Level 2) is included at Note 9, Debt.