Marketable Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Apr. 26, 2015	Jan. 25, 2015
Summary of cash equivalents and marketable securities:
Available-for-sale Securities, Amortized Cost Basis	$ 4,437	$ 4,413
Unrealized Gain	10	11
Unrealized Loss	(1)	(3)
Estimated Fair Value	4,446us-gaap_AvailableForSaleSecurities	4,421us-gaap_AvailableForSaleSecurities
Classified as:
Cash equivalents	118us-gaap_CashEquivalentsAtCarryingValue	295us-gaap_CashEquivalentsAtCarryingValue
Marketable securities	4,328us-gaap_MarketableSecuritiesCurrent	4,126us-gaap_MarketableSecuritiesCurrent
Total cash equivalents and marketable securities	4,446us-gaap_AvailableForSaleSecurities	4,421us-gaap_AvailableForSaleSecurities
Amortized Cost
Less than one year	1,445	1,570
Due in 1-5 years	2,866	2,720
Mortgage-backed securities issued by government-sponsored enterprises not due to a single maturity date	126	123
Total	4,437	4,413
Estimated Fair Value
Less than one year	1,445	1,571
Due in 1-5 years	2,872	2,726
Mortgage-backed securities issued by government-sponsored enterprises not due to a single maturity date	129	124
Total	4,446	4,421
Unrealized Loss Position, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,285
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	43
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,328
Unrealized Loss Position, Aggregate Losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(1)
Net realized gain
Realized Investment Gains	3us-gaap_RealizedInvestmentGainsLosses
Corporate debt securities
Summary of cash equivalents and marketable securities:
Available-for-sale Securities, Amortized Cost Basis	2,214	2,185
Unrealized Gain	4	2
Unrealized Loss	(1)	(1)
Estimated Fair Value	2,217	2,186
Classified as:
Total cash equivalents and marketable securities	2,217	2,186
Unrealized Loss Position, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	573
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	586
Unrealized Loss Position, Aggregate Losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(1)
Debt securities of United States government agencies
Summary of cash equivalents and marketable securities:
Available-for-sale Securities, Amortized Cost Basis	968	750
Unrealized Gain	1	1
Unrealized Loss	0	(1)
Estimated Fair Value	969	750
Classified as:
Total cash equivalents and marketable securities	969	750
Unrealized Loss Position, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	309
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	318
Unrealized Loss Position, Aggregate Losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Asset-backed Securities
Summary of cash equivalents and marketable securities:
Available-for-sale Securities, Amortized Cost Basis	480	453
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	480	453
Classified as:
Total cash equivalents and marketable securities	480	453
Unrealized Loss Position, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	257
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	260
Unrealized Loss Position, Aggregate Losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Debt securities issued by United States Treasury
Summary of cash equivalents and marketable securities:
Available-for-sale Securities, Amortized Cost Basis	415	534
Unrealized Gain	1	3
Unrealized Loss	0	0
Estimated Fair Value	416	537
Classified as:
Total cash equivalents and marketable securities	416	537
Unrealized Loss Position, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	58
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	58
Unrealized Loss Position, Aggregate Losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Mortgage backed securities issued by United Sates government-sponsored enterprises
Summary of cash equivalents and marketable securities:
Available-for-sale Securities, Amortized Cost Basis	260	274
Unrealized Gain	4	5
Unrealized Loss	0	(1)
Estimated Fair Value	264	278
Classified as:
Total cash equivalents and marketable securities	264	278
Unrealized Loss Position, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	74
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	18
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	92
Unrealized Loss Position, Aggregate Losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Foreign government bonds
Summary of cash equivalents and marketable securities:
Available-for-sale Securities, Amortized Cost Basis	81	85
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	81	85
Classified as:
Total cash equivalents and marketable securities	81	85
Unrealized Loss Position, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	14
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	14
Unrealized Loss Position, Aggregate Losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Money market funds
Summary of cash equivalents and marketable securities:
Available-for-sale Securities, Amortized Cost Basis	19	132
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	19	132
Classified as:
Total cash equivalents and marketable securities	$ 19	$ 132

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 325

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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-Subparagraph a

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