Short-term Borrowings and Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Jan. 31, 2024	Jan. 31, 2023
Debt Instrument [Line Items]
Unsecured debt	$ 40,405	$ 39,582
Total debt	39,579	38,840
Less amounts due within one year	(3,447)	(4,191)
Long-term debt	36,132	34,649
Unsecured debt
Debt Instrument [Line Items]
Total debt	39,579
Less amounts due within one year	(3,447)
Total other debt
Debt Instrument [Line Items]
Total other	(826)	(742)
Denominated US Dollar with Fixed Rate
Debt Instrument [Line Items]
Unsecured debt	$ 34,527	$ 33,707
Denominated US Dollar with Fixed Rate \| Unsecured debt
Debt Instrument [Line Items]
Average Rate	3.70%	3.60%
Denominated U S Dollar
Debt Instrument [Line Items]
Unsecured debt	$ 34,527	$ 33,707
Denominated Euro with Fixed Rate
Debt Instrument [Line Items]
Unsecured debt	$ 1,789	$ 1,790
Denominated Euro with Fixed Rate \| Unsecured debt
Debt Instrument [Line Items]
Average Rate	4.00%	4.00%
Denominated Euro
Debt Instrument [Line Items]
Unsecured debt	$ 1,789	$ 1,790
Denominated Sterling with Fixed Rate
Debt Instrument [Line Items]
Unsecured debt	$ 3,412	$ 3,318
Denominated Sterling with Fixed Rate \| Unsecured debt
Debt Instrument [Line Items]
Average Rate	5.40%	5.40%
Denominated Sterling
Debt Instrument [Line Items]
Unsecured debt	$ 3,412	$ 3,318
Denominated Yen with Fixed Rate
Debt Instrument [Line Items]
Unsecured debt	$ 677	$ 767
Denominated Yen with Fixed Rate \| Unsecured debt
Debt Instrument [Line Items]
Average Rate	0.40%	0.40%
Denominated Yen
Debt Instrument [Line Items]
Unsecured debt	$ 677	$ 767

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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