Convertible Debt (Table)

6 Months Ended

Jul. 31, 2016

Convertible Debt [Abstract]

Convertible Debt

The following table presents the carrying value of the Notes:

	July 31,			January 31,
	2016			2016
	(In millions)
1.00% Convertible Senior Notes Due 2018	$	1,500		$	1,500
Unamortized debt discount (1)	(72		)	(87		)
Net carrying amount	$	1,428		$	1,413

(1) As of July 31, 2016, the remaining period over which the unamortized debt discount will be amortized is 2.3 years.

The following table presents interest expense for the contractual interest and the accretion of debt discount and issuance costs:

	Three Months Ended				Six Months Ended
	July 31,		July 26,		July 31,		July 26,
	2016		2015		2016		2015
	(In millions)
Contractual coupon interest expense	$	4	$	4	$	8	$	8
Amortization of debt discount and issuance costs	7		7		14		14
Total interest expense related to Notes	$	11	$	11	$	22	$	22