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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023	Feb. 23, 2024	Nov. 30, 2022	Jan. 31, 2022	Feb. 01, 2018
Shareholders' Equity
Common stock, par (in USD per share)	$ 0.10			$ 0.10
Common stock, shares authorized (in shares)	33,000,000,000	33,000,000,000
Preferred stock, par value (in dollars per share)	$ 0.10
Preferred stock, shares authorized (in shares)	100,000,000
Preferred stock, shares issued (in shares)	0
Preferred stock, shares outstanding (in shares)	0
Purchase of noncontrolling interest		$ 2,443	$ 1,773
Proceeds from issuance or sale of equity	$ 362	716	66
Share-based compensation expense	2,769	2,093	1,578
Tax benefit	700	$ 500	400
Compensation awards (in shares)							780,000,000
PhonePe
Shareholders' Equity
Liability to noncontrolling interest holders			900
2022 Share Repurchase Program
Shareholders' Equity
Repurchase program					$ 20,000
Repurchase amount remaining	12,000
Massmart
Shareholders' Equity
Purchase of noncontrolling interest			$ 400
Aggregate ownership, percent			100.00%			53.00%
Alert Innovation
Shareholders' Equity
Purchase of noncontrolling interest			$ 400
Aggregate ownership, percent			100.00%
PhonePe
Shareholders' Equity
Aggregate ownership, percent		84.00%	89.00%			76.00%
Flipkart
Shareholders' Equity
Purchase of noncontrolling interest	$ 3,500
Aggregate ownership, percent		85.00%	75.00%
Common Stock
Shareholders' Equity
Common shares, outstanding (in shares)	8,000,000,000.0	8,100,000,000
Common shares, issued (in shares)	8,000,000,000.0	8,100,000,000
Restricted Stock Units
Shareholders' Equity
Expected dividend rate	2.00%	2.20%	2.30%
Unrecognized compensation cost	$ 2,243	$ 1,686	$ 1,323
Restricted Stock Units \| Grants Made In Fiscal 2023 or Later \| Quarterly
Shareholders' Equity
Award vesting rights, percentage	8.00%
Restricted Stock Units \| Grants Made In Fiscal 2023 or Later \| Annual
Shareholders' Equity
Vesting period	3 years
Restricted Stock Units \| Grants Made in Fiscal 2020 Through Fiscal 2022 \| Annual
Shareholders' Equity
Award vesting rights, percentage	25.00%
Vesting period	4 years
Restricted Stock
Shareholders' Equity
Share-based compensation expense	$ 1,909	$ 1,258	$ 927
Performance-based Restrict Stock Units
Shareholders' Equity
Vesting period	2 years
Expected dividend rate	3.20%	3.30%	3.30%
Performance period	1 year
Option
Shareholders' Equity
Unrecognized compensation costs, options	$ 3,000
Minimum \| Restricted Stock
Shareholders' Equity
Vesting period	1 month
Minimum \| Performance-based Restrict Stock Units
Shareholders' Equity
Award vesting rights, percentage	0.00%
Vesting period	1 year
Maximum \| Restricted Stock
Shareholders' Equity
Vesting period	3 years
Maximum \| Performance-based Restrict Stock Units
Shareholders' Equity
Award vesting rights, percentage	150.00%
Vesting period	3 years