Segment Information - Reportable Segments and Reconciliation to Consolidated Net Income (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment	3
Segment Reporting Disclosure [Line Items]
Net sales	$ 116,444	$ 108,518
Operating expenses	112,775	99,653
Operating income	3,669	8,865
Total non-operating income (expense)	(8,934)	1,403
Benefit (provision) for income taxes	1,422	(2,156)
Equity-method investment activity, net of tax	(1)	(5)
Net income (loss)	(3,844)	8,107	$ 21,413	$ 26,903
North America
Segment Reporting Disclosure [Line Items]
Net sales	69,244	64,366
Operating expenses	70,812	60,916
Operating income	(1,568)	3,450
International
Segment Reporting Disclosure [Line Items]
Net sales	28,759	30,649
Operating expenses	30,040	29,397
Operating income	(1,281)	1,252
AWS
Segment Reporting Disclosure [Line Items]
Net sales	18,441	13,503
Operating expenses	11,923	9,340
Operating income	$ 6,518	$ 4,163