Equity Equity (Schedule of Share Repurchases) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Class of Stock [Line Items]
Payments for Repurchase of Common Stock			$ 367	$ 768
Class A [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	1.9	1.5	5.0	13.3
Payments for Repurchase of Common Stock	$ 130	$ 90	$ 367	$ 848
Under share repurchase program \| Class A [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	1.8	1.3	4.1	12.5
Payments for Repurchase of Common Stock	$ 120	$ 80	$ 300	$ 797
To fund certain obligations under equity compensation plans \| Class A [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	0.1	0.2	0.9	0.8
Payments for Repurchase of Common Stock	$ 10	$ 10	$ 67	$ 51