Fair Value Measurements (Tables)

12 Months Ended

Sep. 25, 2016

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]

Fair value hierarchy for assets and liabilities measured at fair value on a recurring basis

The following table presents the Company’s fair value hierarchy for assets and liabilities measured at fair value on a recurring basis at September 25, 2016 (in millions):

	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents	$	2,679	$	2,598	$	—	$	5,277
Marketable securities
U.S. Treasury securities and government-related securities	867		1,348		—		2,215
Corporate bonds and notes	—		18,743		—		18,743
Mortgage- and asset-backed and auction rate securities	—		1,854		43		1,897
Equity and preferred securities and equity funds	1,005		741		—		1,746
Debt funds	—		1,803		—		1,803
Total marketable securities	1,872		24,489		43		26,404
Derivative instruments	—		71		—		71
Other investments	303		—		—		303
Total assets measured at fair value	$	4,854	$	27,158	$	43	$	32,055
Liabilities
Derivative instruments	$	—	$	11	$	—	$	11
Other liabilities	302		—		—		302
Total liabilities measured at fair value	$	302	$	11	$	—	$	313

Activity for marketable securities classified within Level 3 of the valuation hierarchy

The following table includes the activity for mortgage- and asset-backed and auction rate securities classified within Level 3 of the valuation hierarchy (in millions):

	2016			2015
Beginning balance of Level 3	$	224		$	269
Total realized and unrealized gains or losses:
Included in investment income, net	(4		)	3
Included in other comprehensive income (loss)	(1		)	(4		)
Purchases	2			69
Sales	(106		)	(46		)
Settlements	(45		)	(64		)
Transfers out of Level 3	(27		)	(3		)
Ending balance of Level 3	$	43		$	224