Investments (Detail) - USD ($) $ in Millions		Sep. 30, 2017	Oct. 01, 2016
Investments [Abstract]
Investments, equity basis	[1]	$ 3,087	$ 4,082
Investments, other		115	198
Investments		$ 3,202	$ 4,280

[1] Prior to September 25, 2017, BAMTech was accounted for under the equity basis of accounting. At September 25, 2017, the Company acquired an additional interest and now consolidates BAMTech (see Note 3 for further discussion of the BAMTech transaction). Accordingly, equity basis investments decreased by approximately $1 billion.