Compensation Expense Related to Stock Options, Stock Appreciation Rights and Restricted Stock Units (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options		$ 21	$ 20	$ 67	$ 62
RSUs		92	69	240	216
Total equity-based compensation expense	[1]	113	89	307	278
Equity-based compensation expense capitalized during the period		$ 17	$ 19	$ 54	$ 61

[1] Equity-based compensation expense is net of capitalized equity-based compensation and excludes amortization of previously capitalized equity-based compensation costs.