QUALCOMM Incorporated Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities Available-for-sale Securities (Details)

Marketable Securities Available-for-sale Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 29, 2015	Mar. 30, 2014	Mar. 29, 2015	Mar. 30, 2014	Sep. 28, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	$ 1,654		$ 1,654		$ 1,769
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	383		383		575
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	0		0		(6)
Available-for-sale Securities Equity Securities, Fair Value	2,037		2,037		2,338
Available-for-sale Debt Securities (including debt funds), Amortized Cost Basis	19,940		19,940		19,582
Available-for-sale Debt Securities (including debt funds), Accumulated Gross Unrealized Gain, before Tax	311		311		312
Available-for-sale Debt Securities (including debt funds), Accumulated Gross Unrealized Loss, before Tax	(81)		(81)		(60)
Available-for-sale Debt Securities, Fair Value	20,170		20,170		19,834
Contractual maturities of available-for-sale debt securities [Abstract]
Years to Maturity - Less Than One Year	2,818		2,818
Years to Maturity - One to Five Years	11,245		11,245
Years to Maturity - Five to Ten Years	1,363		1,363
Years to Maturity - Greater Than Ten Years	592		592
Years to Maturity - No Single Maturity Date	4,152		4,152
Realized Gains and Losses on Sales of Available-for-sale Securities [Abstract]
Gross Realized Gains	128	227	308	343
Gross Realized Losses	(30)	(5)	(37)	(8)
Net Realized Gains	98	222	271	335
Available-for-sale Securities [Abstract]
Cost	21,594		21,594		21,351
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	694		694		887
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(81)		(81)		(66)
Fair Value	22,207us-gaap_AvailableForSaleSecurities		22,207us-gaap_AvailableForSaleSecurities		22,172us-gaap_AvailableForSaleSecurities
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]
Less than 12 months - Fair Value	5,938		5,938		5,906
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(69)		(69)		(38)
More than 12 months - Fair Value	324		324		675
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(12)		(12)		(28)
U.S. Treasury securities and government-related securities [Member]
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]
Less than 12 months - Fair Value	395		395		279
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3)		(3)		(2)
More than 12 months - Fair Value	0		0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0		0
Corporate bonds and notes
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]
Less than 12 months - Fair Value	4,211		4,211		4,924
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(58)		(58)		(31)
More than 12 months - Fair Value	201		201		104
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(10)		(10)		(4)
Mortgage- and asset-backed securities [Member]
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]
Less than 12 months - Fair Value	535		535		484
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)		(1)		(1)
More than 12 months - Fair Value	26		26		52
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0		(1)
Auction rate securities
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]
Less than 12 months - Fair Value	0		0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0		0
More than 12 months - Fair Value	47		47		83
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1)		(1)		(1)
Common and preferred stock
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]
Less than 12 months - Fair Value	13		13		86
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0		(3)
More than 12 months - Fair Value	12		12		52
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0		(3)
Debt funds
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]
Less than 12 months - Fair Value	784		784		133
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(7)		(7)		(1)
More than 12 months - Fair Value	38		38		384
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1)		$ (1)		$ (19)