Revenue - Disaggregated Net Sales and Portion of Net Sales That Was Previously Deferred (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Net sales	$ 416,161	$ 391,035	$ 383,285
Portion of total net sales that was included in deferred revenue as of the beginning of the period	8,229	7,728	8,169
iPhone
Disaggregation of Revenue [Line Items]
Net sales	209,586	201,183	200,583
Mac
Disaggregation of Revenue [Line Items]
Net sales	33,708	29,984	29,357
iPad
Disaggregation of Revenue [Line Items]
Net sales	28,023	26,694	28,300
Wearables, Home and Accessories
Disaggregation of Revenue [Line Items]
Net sales	35,686	37,005	39,845
Services
Disaggregation of Revenue [Line Items]
Net sales	$ 109,158	$ 96,169	$ 85,200