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Financing (Narrative) (Details) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 15, 2016 USD ($) Rate | Dec. 07, 2015 USD ($) | Aug. 17, 2015 USD ($) Rate | Feb. 03, 2018 USD ($) Rate | Jul. 29, 2017 USD ($) | Feb. 03, 2018 USD ($) Rate | Jan. 28, 2017 USD ($) | Jan. 30, 2016 USD ($) | May 06, 2016 USD ($)
Extinguishment of debt |  |  |  | $ 400,000,000 | $ 247,000,000 |  |  |  |
Additional interest expense from early repurchase of debt |  |  |  | (11,000,000) | 1,000,000 | $ (10,000,000) | $ 0 | $ 0 |
Amount of outstanding debt repaid at maturity |  |  |  |  |  | 300,000,000 | 636,000,000 | 69,000,000 |
Debt Instrument, Repurchase Amount |  |  |  | 423,000,000 | $ 257,000,000 | $ 423,000,000 |  |  |
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 |  |
Interest coverage ratio |  |  |  |  |  | 8.94 |  |  |
Leverage ratio |  |  |  |  |  | 2.04 |  |  |
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 |  | 1,500,000,000 |  |  |
commercial paper maximum borrowings |  |  |  |  |  | 0 | 388,000,000 |  |
Prepaid expenses and other current assets pledged as collateral for debt security |  |  |  | 37,000,000 |  | 37,000,000 | 37,000,000 |  |
8.125% Senior Debentures Due 2035 [Member] |  |  |  |  |  |  |  |  |
Extinguishment of debt | $ 108,000,000 |  | $ 76,000,000 |  |  | 0 | 0 | 76,000,000 |
Debt instrument interest rate, stated percentage | Rate |  |  | 8.125% |  |  |  |  |  |
Seven Point Eight Seven Five Percent Senior Debentures Due Two Thousand Thirty Six [Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | Rate | 7.875% |  |  |  |  |  |  |  |
Other Standby and Commercial Letters of Credit [Member] |  |  |  |  |  |  |  |  |
Debt instrument, principal outstanding |  |  |  | 28,000,000 |  | 28,000,000 | 30,000,000 |  |
Six Point Nine Percent Senior Debentures Due Two Thousand Thirty Two [Member] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 147,000,000 |  | $ 219,000,000 | 0 | 0 |
Debt instrument interest rate, stated percentage | Rate |  |  |  | 6.90% |  | 6.90% |  |  |
Debt instrument, principal outstanding |  |  |  | $ 31,000,000 |  | $ 31,000,000 | 250,000,000 |  |
Six Point Seven Percent Senior Debentures Due Two Thousand Thirty Four [Member] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 108,000,000 |  | $ 136,000,000 | 0 | 0 |
Debt instrument interest rate, stated percentage | Rate |  |  |  | 6.70% |  | 6.70% |  |  |
Debt instrument, principal outstanding |  |  |  | $ 264,000,000 |  | $ 264,000,000 | 400,000,000 |  |
Six Point Three Seven Five Percent Senior Notes Due Two Thousand Thirty Seven [Member] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 96,000,000 |  | $ 231,000,000 | 0 | 0 |
Debt instrument interest rate, stated percentage | Rate |  |  |  | 6.375% |  | 6.375% |  |  |
Debt instrument, principal outstanding |  |  |  | $ 269,000,000 |  | $ 269,000,000 | 500,000,000 |  |
Eight Point Seven Five Percent Senior Debentures Due Two Thousand Twenty Nine [Member] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 43,000,000 |  | $ 43,000,000 | 0 | 0 |
Debt instrument interest rate, stated percentage | Rate |  |  |  | 8.75% |  | 8.75% |  |  |
Debt instrument, principal outstanding |  |  |  | $ 18,000,000 |  | $ 18,000,000 | 61,000,000 |  |
Seven Point Eight Seven Five Percent Senior Debentures Due Two Thousand Thirty [Member] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 6,000,000 |  | $ 6,000,000 | 0 | 0 |
Debt instrument interest rate, stated percentage | Rate |  |  |  | 7.875% |  | 7.875% |  |  |
Debt instrument, principal outstanding |  |  |  | $ 12,000,000 |  | $ 12,000,000 | 18,000,000 |  |
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% |  | 3.45% |  |  |
Debt instrument, principal outstanding |  |  |  | $ 500,000,000 |  | $ 500,000,000 | 500,000,000 |  |
3.625% senior notes due 2024 [Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | Rate |  |  |  | 3.625% |  | 3.625% |  |  |
Debt instrument, principal outstanding |  |  |  | $ 500,000,000 |  | $ 500,000,000 | 500,000,000 |  |
7.875% Senior Notes Due 2015 [Member] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  | $ 0 | 108,000,000 | $ 0 |
4.375% Senior notes due 2023 [Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | Rate |  |  |  | 4.375% |  | 4.375% |  |  |
Debt instrument, principal outstanding |  |  |  | $ 400,000,000 |  | $ 400,000,000 | 400,000,000 |  |
3.875% Senior notes due 2022 [Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | Rate |  |  |  | 3.875% |  | 3.875% |  |  |
Debt instrument, principal outstanding |  |  |  | $ 550,000,000 |  | $ 550,000,000 | 550,000,000 |  |
5.125% Senior debentures due 2042 [Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | Rate |  |  |  | 5.125% |  | 5.125% |  |  |
Debt instrument, principal outstanding |  |  |  | $ 250,000,000 |  | $ 250,000,000 | 250,000,000 |  |
2.875% Senior notes due 2023 [Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | Rate |  |  |  | 2.875% |  | 2.875% |  |  |
Debt instrument, principal outstanding |  |  |  | $ 750,000,000 |  | $ 750,000,000 | 750,000,000 |  |
4.3% Senior notes due 2043 [Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | Rate |  |  |  | 4.30% |  | 4.30% |  |  |
Debt instrument, principal outstanding |  |  |  | $ 250,000,000 |  | $ 250,000,000 | 250,000,000 |  |
4.5% senior notes due 2034[Member] |  |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | Rate |  |  |  | 4.50% |  | 4.50% |  |  |
Debt instrument, principal outstanding |  |  |  | $ 550,000,000 |  | $ 550,000,000 | 550,000,000 |  |
Fair Value |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | 5,751,000,000 |  | 5,751,000,000 | 6,438,000,000 |  |
Carrying Amount |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 5,835,000,000 |  | $ 5,835,000,000 | 6,535,000,000 |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  | $ 0 |  |

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