Dispositions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2015	Oct. 31, 2014	Oct. 02, 2015	Oct. 31, 2014
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Income (loss) from discontinued operations before income taxes	$ 0	$ (1)	$ 0	$ (12)
Intangible impairment	4	17	73	41
Other Disposals
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues	4	13	18	59
Cost of revenues	4	10	16	53
Selling, general and administrative expenses	0	5	4	24
Intangible asset impairment charges	0	0	0	3
Operating loss	0	(2)	(2)	(21)
Non-operating income	0	1	2	9
Income (loss) from discontinued operations before income taxes	$ 0	(1)	$ 0	$ (12)
Intangible impairment		$ 9