Debt (Long-Term Debt) (Details) - USD ($) $ in Millions	Jan. 31, 2016	Feb. 01, 2015
Debt Instrument [Line Items]
Senior Notes	$ 20,200	$ 16,200
Capital Lease Obligations; payable in varying installments through January 31, 2055	763	684
Other	1	3
Total debt	20,965	16,907
Less current installments	77	38
Long-Term Debt, excluding current installments	20,888	16,869
5.40% Senior Notes due March 1, 2016 [Member]
Debt Instrument [Line Items]
Senior Notes	3,010	3,026
Floating Rate Senior Notes Due September 15, 2017 [Member]
Debt Instrument [Line Items]
Senior Notes	500	0
2.25% Senior Notes due September 10, 2018 [Member]
Debt Instrument [Line Items]
Senior Notes	1,158	1,157
2.00% Senior Notes due June 15, 2019 [Member]
Debt Instrument [Line Items]
Senior Notes	997	996
3.95% Senior Notes due September 15, 2020 [Member]
Debt Instrument [Line Items]
Senior Notes	525	524
4.40% Senior Notes due April 1, 2021 [Member]
Debt Instrument [Line Items]
Senior Notes	999	999
2.625% Senior Notes Due June 1, 2022 [Member]
Debt Instrument [Line Items]
Senior Notes	1,246	0
2.70% Senior Notes due April 1, 2023 [Member]
Debt Instrument [Line Items]
Senior Notes	999	999
3.75% Senior Notes due February 15, 2024 [Member]
Debt Instrument [Line Items]
Senior Notes	1,095	1,095
3.35% Senior Notes Due September 15, 2025 [Member]
Debt Instrument [Line Items]
Senior Notes	999	0
5.875% Senior Notes due December 16, 2036 [Member]
Debt Instrument [Line Items]
Senior Notes	2,964	2,963
5.40% Senior Notes due September 15, 2040 [Member]
Debt Instrument [Line Items]
Senior Notes	499	499
5.95% Senior Notes due April 1, 2041 [Member]
Debt Instrument [Line Items]
Senior Notes	996	996
4.20% Senior Notes due April 1, 2043 [Member]
Debt Instrument [Line Items]
Senior Notes	996	996
4.875% Senior Notes due February 15, 2044 [Member]
Debt Instrument [Line Items]
Senior Notes	986	985
4.40% Senior Notes due March 15, 2045 [Member]
Debt Instrument [Line Items]
Senior Notes	985	985
4.25% Senior Notes Due April 1, 2046 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 1,247	$ 0

Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

+ Details

Name:	us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section H

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

+ Details

Name:	us-gaap_OtherLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_SeniorNotes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant