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Financing (Narrative) (Details) |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 15, 2016 USD ($) Rate | Dec. 07, 2015 USD ($) | Aug. 17, 2015 USD ($) Rate | Nov. 18, 2014 USD ($) | May 23, 2014 USD ($) | Jan. 28, 2017 USD ($) Rate | Jan. 30, 2016 USD ($) | Jan. 31, 2015 USD ($) | May 06, 2016 USD ($)
Extinguishment of debt |  |  |  | $ 407,000,000 |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 6,438,000,000 | $ 6,756,000,000 |  |
Additional interest expense from early repurchase of debt |  |  |  |  |  | 0 | 0 | $ 17,000,000 |
Amount of outstanding debt repaid at maturity |  |  |  |  |  | 636,000,000 | 69,000,000 | 453,000,000 |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 1,500,000,000
Line of credit facility, maximum borrowing capacity at Company's option |  |  |  |  |  |  |  |  | $ 1,750,000,000
Letters of Credit Outstanding, Amount |  |  |  |  |  | $ 0 | 1,000,000 |  |
Interest coverage ratio |  |  |  |  |  | 7.36 |  |  |
Leverage ratio |  |  |  |  |  | 2.38 |  |  |
Minimum specified interest coverage ratio in credit agreement |  |  |  |  |  | 3.25 |  |  |
Maximum specified leverage ratio in credit agreement |  |  |  |  |  | 3.75 |  |  |
Amount non-recurring cash charges may not exceed in credit agreement |  |  |  |  |  | $ 300,000,000 |  |  |
Amount of indebtedness due prior to maturity that would result in default under credit agreements |  |  |  |  |  | 150,000,000 |  |  |
Cross Default Provision In Credit Agreement Floor |  |  |  |  |  | 100,000,000 |  |  |
Commercial paper |  |  |  |  |  | 1,500,000,000 |  |  |
commercial paper maximum borrowings |  |  |  |  |  | 388,000,000 |  |  |
Prepaid expenses and other current assets pledged as collateral for debt security |  |  |  |  |  | 37,000,000 | 37,000,000 |  |
8.125% Senior Debentures Due 2035 [Member] |  |  |  |  |  |  |  |  |
Extinguishment of debt | $ 108,000,000 |  | $ 76,000,000 |  |  | $ 0 | 76,000,000 | 0 |
Debt instrument interest rate, stated percentage | Rate | 7.875% |  | 8.125% |  |  | 8.125% |  |  |
7.875% Senior Notes Due 2015 [Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage |  |  |  | 7.875% |  |  |  |  |
Other Standby and Commercial Letters of Credit [Member] |  |  |  |  |  |  |  |  |
Debt instrument, principal outstanding |  |  |  |  |  | $ 30,000,000 | 21,000,000 |  |
3.45% senior notes due 2021 [Member] |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 500,000,000 |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage |  | 3.45% |  |  |  | 3.45% |  |  |
Debt instrument, principal outstanding |  |  |  |  |  | $ 500,000,000 | 500,000,000 |  |
3.625% senior notes due 2024 [Member] |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  | $ 500,000,000 |  |  |  |
Debt instrument interest rate, stated percentage |  |  |  |  | 3.625% | 3.625% |  |  |
Debt instrument, principal outstanding |  |  |  |  |  | $ 500,000,000 | 500,000,000 |  |
7.875% Senior Notes Due 2015 [Member] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  | $ 108,000,000 | 0 | $ 0 |
Debt instrument interest rate, stated percentage | Rate |  |  |  |  |  | 7.875% |  |  |
4.375% Senior notes due 2023 [Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | Rate |  |  |  |  |  | 4.375% |  |  |
Debt instrument, principal outstanding |  |  |  |  |  | $ 400,000,000 | 400,000,000 |  |
3.875% Senior notes due 2022 [Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | Rate |  |  |  |  |  | 3.875% |  |  |
Debt instrument, principal outstanding |  |  |  |  |  | $ 550,000,000 | 550,000,000 |  |
5.125% Senior debentures due 2042 [Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | Rate |  |  |  |  |  | 5.125% |  |  |
Debt instrument, principal outstanding |  |  |  |  |  | $ 250,000,000 | 250,000,000 |  |
2.875% Senior notes due 2023 [Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | Rate |  |  |  |  |  | 2.875% |  |  |
Debt instrument, principal outstanding |  |  |  |  |  | $ 750,000,000 | 750,000,000 |  |
4.3% Senior notes due 2043 [Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | Rate |  |  |  |  |  | 4.30% |  |  |
Debt instrument, principal outstanding |  |  |  |  |  | $ 250,000,000 | 250,000,000 |  |
4.5% senior notes due 2034[Member] |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  | $ 550,000,000 |  |  |  |  |
Debt instrument interest rate, stated percentage |  |  |  | 4.50% |  | 4.50% |  |  |
Debt instrument, principal outstanding |  |  |  |  |  | $ 550,000,000 | 550,000,000 |  |
Carrying Amount |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 6,535,000,000 | 6,966,000,000 |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  | $ 0 | $ 0 |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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 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 Reference 3: 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
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 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 Reference 3: 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
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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