Revenue - Disaggregated Net Sales and Portion of Net Sales That Was Previously Deferred (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2025	Dec. 28, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 143,756	$ 124,300
Portion of total net sales that was included in deferred revenue as of the beginning of the period	4,050	3,690
iPhone
Disaggregation of Revenue [Line Items]
Net sales	85,269	69,138
Mac
Disaggregation of Revenue [Line Items]
Net sales	8,386	8,987
iPad
Disaggregation of Revenue [Line Items]
Net sales	8,595	8,088
Wearables, Home and Accessories
Disaggregation of Revenue [Line Items]
Net sales	11,493	11,747
Services
Disaggregation of Revenue [Line Items]
Net sales	$ 30,013	$ 26,340