Summary of Significant Accounting Policies (Schedule of Supplementary Cash Flow Information) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Oct. 31, 2014	Nov. 01, 2013
Accounting Policies [Abstract]
Vested stock issued as settlement of annual bonus accruals	$ 1	$ 2
Stock issued in lieu of cash dividends	2	17
Fair value of assets acquired in acquisitions	0	259
Cash paid in acquisitions	0	(1)
Forgiveness of accounts receivable to acquire equity interest in business combination	0	(105)
Accrued liability for acquisition of business	0	(5)
Liabilities assumed in acquisitions	0	(148)
Cash paid for interest (including discontinued operations)	41	37
Cash paid for income taxes, net of refunds (including discontinued operations)	$ 22	$ 62