Revenue - Disaggregated Net Sales and Portion of Net Sales That Was Previously Deferred (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 28, 2026	Mar. 29, 2025	Mar. 28, 2026	Mar. 29, 2025
Disaggregation of Revenue [Line Items]
Net sales	$ 111,184	$ 95,359	$ 254,940	$ 219,659
Portion of total net sales that was included in deferred revenue as of the beginning of the period	3,987	3,672	5,834	5,440
iPhone
Disaggregation of Revenue [Line Items]
Net sales	56,994	46,841	142,263	115,979
Mac
Disaggregation of Revenue [Line Items]
Net sales	8,399	7,949	16,785	16,936
iPad
Disaggregation of Revenue [Line Items]
Net sales	6,914	6,402	15,509	14,490
Wearables, Home and Accessories
Disaggregation of Revenue [Line Items]
Net sales	7,901	7,522	19,394	19,269
Services
Disaggregation of Revenue [Line Items]
Net sales	$ 30,976	$ 26,645	$ 60,989	$ 52,985