Segment Information - Reportable Segments and Reconciliation to Consolidated Net Income (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment	3
Segment Reporting Disclosure [Line Items]
Net sales	$ 143,313	$ 127,358
Operating expenses	128,006	122,584
Operating income	15,307	4,774
Total non-operating expense	(2,324)	(655)
Provision for income taxes	(2,467)	(948)
Equity-method investment activity, net of tax	(85)	1
Net income	10,431	3,172	$ 37,684	$ 4,294
North America
Segment Reporting Disclosure [Line Items]
Net sales	86,341	76,881
Operating expenses	81,358	75,983
Operating income	4,983	898
International
Segment Reporting Disclosure [Line Items]
Net sales	31,935	29,123
Operating expenses	31,032	30,370
Operating income	903	(1,247)
AWS
Segment Reporting Disclosure [Line Items]
Net sales	25,037	21,354
Operating expenses	15,616	16,231
Operating income	$ 9,421	$ 5,123