Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022	Nov. 30, 2022	Jan. 31, 2021	Feb. 01, 2018
Shareholders' Equity
Common stock, par (in USD per share)	$ 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	$ 2,443.0	$ 1,773.0
Proceeds from issuance or sale of equity	716.0	66.0	$ 3,239.0
Share-based compensation expense	2,093.0	1,578.0	1,163.0
Tax benefit	500.0	400.0	$ 300.0
Compensation awards (in shares)						780,000,000
PhonePe
Shareholders' Equity
Liability to noncontrolling interest holders		900.0
2022 Share Repurchase Program
Shareholders' Equity
Repurchase program				$ 20,000.0
Repurchase amount remaining	$ 16,500.0
Massmart
Shareholders' Equity
Purchase of noncontrolling interest		$ 400.0
Aggregate ownership, percent		100.00%	53.00%
Alert Innovation
Shareholders' Equity
Purchase of noncontrolling interest		$ 400.0
Aggregate ownership, percent		100.00%
PhonePe
Shareholders' Equity
Aggregate ownership, percent	84.00%	89.00%	76.00%
Flipkart
Shareholders' Equity
Purchase of noncontrolling interest	$ 3,500.0
Aggregate ownership, percent	85.00%	75.00%	75.00%		83.00%
Common Stock
Shareholders' Equity
Common shares, outstanding (in shares)	8,100,000,000	8,100,000,000
Common shares, issued (in shares)	8,100,000,000	8,100,000,000
Restricted stock units
Shareholders' Equity
Share-based compensation expense	$ 1,258.0	$ 927.0	$ 659.0
Expected dividend rate	2.20%	2.30%	3.80%
Restricted stock and performance-based restricted stock units
Shareholders' Equity
Expected dividend rate	3.30%	3.30%	4.20%
Annual | Restricted stock units | Grants Made In Fiscal 2023 or Later
Shareholders' Equity
Vesting period	3 years
Annual | Restricted stock units | Grants Made in Fiscal 2020 Through Fiscal 2022
Shareholders' Equity
Award vesting rights, percentage	25.00%
Vesting period	4 years
Three Years from Grant Date | Restricted stock units | Grants Made Prior to Fiscal 2020
Shareholders' Equity
Award vesting rights, percentage	50.00%
Five Years from Grant Date | Restricted stock units | Grants Made Prior to Fiscal 2020
Shareholders' Equity
Award vesting rights, percentage	50.00%
Quarterly | Restricted stock units | Grants Made In Fiscal 2023 or Later
Shareholders' Equity
Award vesting rights, percentage	8.00%
Minimum | Restricted stock units | Grants Made Prior to Fiscal 2020
Shareholders' Equity
Vesting period	3 years
Minimum | Restricted stock and performance-based restricted stock units
Shareholders' Equity
Award vesting rights, percentage	0.00%
Vesting period	1 year
Minimum | Performance-based restricted stock
Shareholders' Equity
Vesting period	1 month
Maximum | Restricted stock units | Grants Made Prior to Fiscal 2020
Shareholders' Equity
Vesting period	5 years
Maximum | Restricted stock and performance-based restricted stock units
Shareholders' Equity
Award vesting rights, percentage	150.00%
Vesting period	3 years
Maximum | Performance-based restricted stock
Shareholders' Equity
Vesting period	3 years