CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017
Statement of Comprehensive Income [Abstract]
Change in foreign currency translation, tax effects	$ 8	$ (44)	$ 7	$ 32
Change in fair value of derivatives, tax benefit/(expense)	(64)	(25)	(130)	(253)
Adjustment for net (gains)/losses realized and included in net income, tax expense/(benefit)	77	311	56	100
Change in fair value of marketable securities, tax benefit/(expense)	541	(256)	1,005	733
Adjustment for net (gains)/losses realized and included in net income, tax expense/(benefit)	$ (7)	$ 7	$ 34	$ (4)