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Debt (Table)
 12 Months Ended
Jan. 28, 2018
Debt Disclosure [Abstract]  
Long-term Debt
The carrying value of our long-term debt and the associated interest rates were as follows:
 
 
Expected
Remaining Term (years)
 
Effective
Interest Rate
 
January 28,
2018
 
January 29,
2017
 
 
 
 
 
 
(In millions)
2.20% Notes Due 2021
 
3.6
 
2.38%
 
$
1,000

 
$
1,000

3.20% Notes Due 2026
 
8.6
 
3.31%
 
1,000

 
1,000

Unamortized debt discount and issuance costs
 
 
 
 
 
(15
)
 
(17
)
Net carrying amount
 
 
 
 
 
$
1,985

 
$
1,983
Convertible Debt
The following table presents the carrying value of the Convertible Notes:
 
January 28,
2018
 
January 29,
2017
 
(In millions)
1.00% Convertible Senior Notes
$
15

 
$
827

Unamortized debt discount (1)
—

 
(31
)
Net carrying amount
$
15

 
$
796

(1) As of January 28, 2018, the balance of unamortized debt discount was not significant and will be fully amortized in fiscal year 2019.
The following table presents interest expense for the contractual interest and the accretion of debt discount and issuance costs related to the Convertible Notes:
 
Year Ended
 
January 28,
2018
 
January 29,
2017
 
January 31,
2016
 
(In millions)
Contractual coupon interest expense
$
—

 
$
9

 
$
15

Amortization of debt discount
2

 
24

 
29

Total interest expense related to Convertible Notes
$
2

 
$
33

 
$
44