Revenue - Net Sales Disaggregated by Significant Products and Services (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 30, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Net sales	$ 119,575	$ 117,154
iPhone
Disaggregation of Revenue [Line Items]
Net sales	69,702	65,775
Mac
Disaggregation of Revenue [Line Items]
Net sales	7,780	7,735
iPad
Disaggregation of Revenue [Line Items]
Net sales	7,023	9,396
Wearables, Home and Accessories
Disaggregation of Revenue [Line Items]
Net sales	11,953	13,482
Services
Disaggregation of Revenue [Line Items]
Net sales	$ 23,117	$ 20,766