Revenue - Disaggregated Net Sales and Portion of Net Sales That Was Previously Deferred (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 95,359	$ 90,753	$ 219,659	$ 210,328
Portion of total net sales that was included in deferred revenue as of the beginning of the period	3,672	3,282	5,440	5,135
iPhone
Disaggregation of Revenue [Line Items]
Net sales	46,841	45,963	115,979	115,665
Mac
Disaggregation of Revenue [Line Items]
Net sales	7,949	7,451	16,936	15,231
iPad
Disaggregation of Revenue [Line Items]
Net sales	6,402	5,559	14,490	12,582
Wearables, Home and Accessories
Disaggregation of Revenue [Line Items]
Net sales	7,522	7,913	19,269	19,866
Services
Disaggregation of Revenue [Line Items]
Net sales	$ 26,645	$ 23,867	$ 52,985	$ 46,984