Litigation and Other Charges (Reorganization Accrual) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Oct. 28, 2017	Oct. 28, 2017
Beginning balance
Amounts charged to expense	$ 13	13
Cash payments		(2)
Ending balance	11	11
Other Related Charges [Member]
Beginning balance
Amounts charged to expense		2
Ending balance	2	2
Severance and Benefit Costs [Member]
Beginning balance
Amounts charged to expense		11
Cash payments		(2)
Ending balance	$ 9	$ 9