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Short-term Borrowings and Long-term Debt (Schedule of Fiscal Year 2018 Debt Issuances) (Details) ¥ in Millions, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 20, 2017 USD ($) | Jul. 18, 2017 USD ($) | Jan. 31, 2018 USD ($) | Jan. 31, 2017 USD ($) | Jan. 31, 2016 USD ($) | Jul. 18, 2017 JPY (¥)
Schedule of Fiscal Year 2018 Debt Issuances [Line Items] |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  | $ 7,476 | $ 137 | $ 39 |
0.183% Debt Issuance, Due 2022 [Domain] | Unsecured debt |  |  |  |  |  |
Schedule of Fiscal Year 2018 Debt Issuances [Line Items] |  |  |  |  |  |
Principal amount | ¥ |  |  |  |  |  | ¥ 70,000
Interest rate |  |  |  |  |  | 0.183%
Proceeds from issuance of long-term debt |  | $ 619 |  |  |  |
0.298% Debt Issuance, Due 2024 [Domain] | Unsecured debt |  |  |  |  |  |
Schedule of Fiscal Year 2018 Debt Issuances [Line Items] |  |  |  |  |  |
Principal amount | ¥ |  |  |  |  |  | ¥ 40,000
Interest rate |  |  |  |  |  | 0.298%
Proceeds from issuance of long-term debt |  | 354 |  |  |  |
0.520% Debt Issuance, Due 2027 [Domain] | Unsecured debt |  |  |  |  |  |
Schedule of Fiscal Year 2018 Debt Issuances [Line Items] |  |  |  |  |  |
Principal amount | ¥ |  |  |  |  |  | ¥ 60,000
Interest rate |  |  |  |  |  | 0.52%
Proceeds from issuance of long-term debt |  | $ 530 |  |  |  |
Variable Rate Debt, Due 2019 [Domain] | Unsecured debt |  |  |  |  |  |
Schedule of Fiscal Year 2018 Debt Issuances [Line Items] |  |  |  |  |  |
Principal amount | $ 300 |  |  |  |  |
Proceeds from issuance of long-term debt | 299 |  |  |  |  |
1.75% Debt Issuance, Due 2019 [Domain] | Unsecured debt |  |  |  |  |  |
Schedule of Fiscal Year 2018 Debt Issuances [Line Items] |  |  |  |  |  |
Principal amount | $ 1,200 |  |  |  |  |
Interest rate | 1.75% |  |  |  |  |
Proceeds from issuance of long-term debt | $ 1,198 |  |  |  |  |
1.900% Debt Issuance, Due 2020 [Domain] | Unsecured debt |  |  |  |  |  |
Schedule of Fiscal Year 2018 Debt Issuances [Line Items] |  |  |  |  |  |
Principal amount | $ 1,250 |  |  |  |  |
Interest rate | 1.90% |  |  |  |  |
Proceeds from issuance of long-term debt | $ 1,245 |  |  |  |  |
2.350% Debt Issuance, Due 2022 [Domain] | Unsecured debt |  |  |  |  |  |
Schedule of Fiscal Year 2018 Debt Issuances [Line Items] |  |  |  |  |  |
Principal amount | $ 1,250 |  |  |  |  |
Interest rate | 2.35% |  |  |  |  |
Proceeds from issuance of long-term debt | $ 1,245 |  |  |  |  |
2.650% Debt Issuance, Due 2024 [Domain] | Unsecured debt |  |  |  |  |  |
Schedule of Fiscal Year 2018 Debt Issuances [Line Items] |  |  |  |  |  |
Principal amount | $ 1,000 |  |  |  |  |
Interest rate | 2.65% |  |  |  |  |
Proceeds from issuance of long-term debt | $ 996 |  |  |  |  |
3.625% Debt Issuance, Due 2047 [Domain] | Unsecured debt |  |  |  |  |  |
Schedule of Fiscal Year 2018 Debt Issuances [Line Items] |  |  |  |  |  |
Principal amount | $ 1,000 |  |  |  |  |
Interest rate | 3.625% |  |  |  |  |
Proceeds from issuance of long-term debt | $ 990 |  |  |  |  |

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