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Long-term Debt Schedule of Fiscal Year 2020 Debt Maturities (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Feb. 01, 2019
Schedule of Fiscal 2020 Debt Maturities [Line Items]      
Repayments of long-term debt $ 364 $ 2,521  
4.130% Fixed Rate Debt (500 USD), Due 2019 [Member] | Unsecured Debt [Member]      
Schedule of Fiscal 2020 Debt Maturities [Line Items]      
Debt instrument, principal amount     $ 500
Debt instrument, interest rate     4.125%
Repayments of long-term debt $ 364