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Short-term Borrowings and Long-term Debt (Schedule of Fiscal Year 2018 and 2017 Debt Maturities) (Details) £ in Millions, $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2018 USD ($) | Jan. 31, 2017 USD ($) | Jan. 31, 2016 USD ($) | Jan. 25, 2018 USD ($) | Jan. 25, 2018 GBP (£) | Nov. 06, 2017 USD ($) | Apr. 21, 2017 USD ($) | Apr. 05, 2017 USD ($) | Apr. 15, 2016 USD ($) | Apr. 11, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt | $ 13,061 | $ 2,055 | $ 4,432 |  |  |  |  |  |  |
Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt | 12,772 | 2,000 |  |  |  |  |  |  |  |
Repayments of long-term debt, matured | 1,500 |  |  |  |  |  |  |  |  |
Repayment of long-term debt, partial extinguishment | 11,272 |  |  |  |  |  |  |  |  |
Unsecured debt | 5.375% Fixed Rate Debt, Due 2017 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 1,000 |  |
Interest rate |  |  |  |  |  |  |  | 5.375% |  |
Repayments of long-term debt | 1,000 |  |  |  |  |  |  |  |  |
Unsecured debt | 1.000% Fixed Rate Debt, Due 2017 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 500 |  |  |
Interest rate |  |  |  |  |  |  | 1.00% |  |  |
Repayments of long-term debt | 500 |  |  |  |  |  |  |  |  |
Unsecured debt | 1.950% Fixed Rate Debt, Due 2018 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 1,000 |  |  |  |  |  |
Interest rate |  |  |  | 1.95% | 1.95% |  |  |  |  |
Repayments of long-term debt | 276 |  |  |  |  |  |  |  |  |
Unsecured debt | 4.125% Fixed Rate Debt, Due 2019 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 500 |  |  |  |
Interest rate |  |  |  |  |  | 4.125% |  |  |  |
Repayments of long-term debt | 136 |  |  |  |  |  |  |  |  |
Unsecured debt | 3.625% Fixed Rate Debt, Due 2020 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 1,500 |  |  |  |
Interest rate |  |  |  |  |  | 3.625% |  |  |  |
Repayments of long-term debt | 661 |  |  |  |  |  |  |  |  |
Unsecured debt | 3.250% Fixed Rate Debt, Due 2020 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 1,750 |  |  |  |  |  |
Interest rate |  |  |  | 3.25% | 3.25% |  |  |  |  |
Repayments of long-term debt | 553 |  |  |  |  |  |  |  |  |
Unsecured debt | 4.250% Fixed Rate Debt, Due 2021 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 1,000 |  |  |  |  |  |
Interest rate |  |  |  | 4.25% | 4.25% |  |  |  |  |
Repayments of long-term debt | 491 |  |  |  |  |  |  |  |  |
Unsecured debt | 6.750% Fixed Rate Date, Due 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 250 |  |  |  |  |  |
Interest rate |  |  |  | 6.75% | 6.75% |  |  |  |  |
Repayments of long-term debt | 98 |  |  |  |  |  |  |  |  |
Unsecured debt | 5.875% Fixed Rate Debt, Due 2027 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 750 |  |  |  |  |  |
Interest rate |  |  |  | 5.875% | 5.875% |  |  |  |  |
Repayments of long-term debt | 267 |  |  |  |  |  |  |  |  |
Unsecured debt | 7.550% Fixed Rate Debt, Due 2030 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 500 |  |  |  |  |  |
Interest rate |  |  |  | 7.55% | 7.55% |  |  |  |  |
Repayments of long-term debt | 412 |  |  |  |  |  |  |  |  |
Unsecured debt | 5.250% Fixed Rate Debt, Due 2035 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 2,500 | £ 1,000 |  |  |  |  |
Interest rate |  |  |  | 5.25% | 5.25% |  |  |  |  |
Repayments of long-term debt | 532 |  |  |  |  |  |  |  |  |
Unsecured debt | 5.250% Fixed Rate Debt (GBP), Due 2035 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt | 260 |  |  |  |  |  |  |  |  |
Unsecured debt | 6.500% Fixed Rate Debt, Due 2037 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 3,000 |  |  |  |  |  |
Interest rate |  |  |  | 6.50% | 6.50% |  |  |  |  |
Repayments of long-term debt | 1,700 |  |  |  |  |  |  |  |  |
Unsecured debt | 6.200% Fixed Rate Debt, Due 2038 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 2,000 |  |  |  |  |  |
Interest rate |  |  |  | 6.20% | 6.20% |  |  |  |  |
Repayments of long-term debt | 1,081 |  |  |  |  |  |  |  |  |
Unsecured debt | 4.875% Fixed Rate Debt, Due 2039 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  | £ 1,000 |  |  |  |  |
Interest rate |  |  |  | 4.875% | 4.875% |  |  |  |  |
Repayments of long-term debt | 851 |  |  |  |  |  |  |  |  |
Unsecured debt | 5.625% Fixed Rate Debt, Due 2040 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 1,250 |  |  |  |  |  |
Interest rate |  |  |  | 5.625% | 5.625% |  |  |  |  |
Repayments of long-term debt | 499 |  |  |  |  |  |  |  |  |
Unsecured debt | 4.875% Fixed Rate Debt, Due 2040 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 750 |  |  |  |  |  |
Interest rate |  |  |  | 4.875% | 4.875% |  |  |  |  |
Repayments of long-term debt | 372 |  |  |  |  |  |  |  |  |
Unsecured debt | 5.000% Fixed Rate Debt, Due 2040 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 1,250 |  |  |  |  |  |
Interest rate |  |  |  | 5.00% | 5.00% |  |  |  |  |
Repayments of long-term debt | 731 |  |  |  |  |  |  |  |  |
Unsecured debt | 5.625% Fixed Rate Debt, Due 2041 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 2,000 |  |  |  |  |  |
Interest rate |  |  |  | 5.625% | 5.625% |  |  |  |  |
Repayments of long-term debt | 1,082 |  |  |  |  |  |  |  |  |
Unsecured debt | 4.000% Fixed Rate Debt, Due 2043 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 1,000 |  |  |  |
Interest rate |  |  |  |  |  | 4.00% |  |  |  |
Repayments of long-term debt | 291 |  |  |  |  |  |  |  |  |
Unsecured debt | 4.750% Fixed Rate Debt, Due 2043 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 750 |  |  |  |  |  |
Interest rate |  |  |  | 4.75% | 4.75% |  |  |  |  |
Repayments of long-term debt | 481 |  |  |  |  |  |  |  |  |
Unsecured debt | 4.300% Fixed Rate Debt, Due 2044 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 1,000 |  |  |  |  |  |
Interest rate |  |  |  | 4.30% | 4.30% |  |  |  |  |
Repayments of long-term debt | $ 498 |  |  |  |  |  |  |  |  |
Unsecured debt | 0.600% Fixed Rate Debt, Due 2016 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 1,000
Interest rate |  |  |  |  |  |  |  |  |  | 0.60%
Repayments of long-term debt |  | 1,000 |  |  |  |  |  |  |  |
Unsecured debt | 2.800% Fixed Rate Debt, Due 2016 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 1,000 |
Interest rate |  |  |  |  |  |  |  |  | 2.80% |
Repayments of long-term debt |  | $ 1,000 |  |  |  |  |  |  |  |

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