Accumulated Other Comprehensive Loss - Composition of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	$ 83,754	$ 91,891	$ 87,531
Other comprehensive loss before reclassifications, net	314	(1,711)	(1,133)
Reclassifications related to business dispositions, net			4,059
Reclassifications to income, net	64	59	74
Return of currency translation adjustment to parent	(2,443)	(1,773)
Ending balances	90,349	83,754	91,891
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(11,680)	(8,766)	(11,766)
Ending balances	(11,302)	(11,680)	(8,766)
Currency Translation and Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(10,816)	(8,100)	(10,772)
Other comprehensive loss before reclassifications, net	333	(1,145)	(586)
Reclassifications related to business dispositions, net			3,258
Reclassifications to income, net	0	(309)	0
Return of currency translation adjustment to parent		(1,262)
Ending balances	(10,483)	(10,816)	(8,100)
Net Investment Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	94	94	1,296
Other comprehensive loss before reclassifications, net	0	0	(7)
Reclassifications related to business dispositions, net			(1,195)
Reclassifications to income, net	0	0	0
Return of currency translation adjustment to parent		0
Ending balances	94	94	94
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(951)	(748)	(304)
Other comprehensive loss before reclassifications, net	(8)	(571)	(540)
Reclassifications related to business dispositions, net			30
Reclassifications to income, net	64	368	66
Return of currency translation adjustment to parent		0
Ending balances	(895)	(951)	(748)
Minimum Pension Liability
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(7)	(12)	(1,986)
Other comprehensive loss before reclassifications, net	(11)	5	0
Reclassifications related to business dispositions, net			1,966
Reclassifications to income, net	0	0	8
Return of currency translation adjustment to parent		0
Ending balances	$ (18)	(7)	$ (12)
Return of Foreign Currency to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Return of currency translation adjustment to parent		$ (1,262)