Long-Term Debt
 9 Months Ended
Oct. 31, 2015
Debt Disclosure [Abstract]  
Long-Term Debt
5. Long-term Debt
 
Outstanding Principal
 
Unamortized Debt Issuance Costs
 
Net Carrying Amount
($ in millions)
October 31, 2015
 
November 1, 2014
 
January 31, 2015
 
October 31, 2015
 
November 1, 2014
 
January 31, 2015
 
October 31, 2015
 
November 1, 2014
 
January 31, 2015
5.65% Senior Notes Due 2020(1)
$
400

 
$
400

 
$
400

 
$
4

 
$
5

 
$
5

 
$
396

 
$
395

 
$
395

5.75% Senior Notes Due 2018(1)
300

 
300

 
300

 
1

 
1

 
1

 
299

 
299

 
299

6.375% Senior Notes Due 2036(1)
400

 
400

 
400

 
6

 
7

 
7

 
394

 
393

 
393

6.9% Notes Due 2026
2

 
2

 
2

 
—

 
—

 
—

 
2

 
2

 
2

7.125% Debentures Due 2023
10

 
10

 
10

 
—

 
—

 
—

 
10

 
10

 
10

7.4% Debentures Due 2037
326

 
326

 
326

 
1

 
1

 
1

 
325

 
325

 
325

7.625% Notes Due 2097
500

 
500

 
500

 
—

 
—

 
—

 
500

 
500

 
500

7.65% Debentures Due 2016
78

 
78

 
78

 
—

 
—

 
—

 
78

 
78

 
78

7.95% Debentures Due 2017
220

 
220

 
220

 
—

 
—

 
—

 
220

 
220

 
220

8.125% Senior Notes Due 2019
400

 
400

 
400

 
8

 
10

 
10

 
392

 
390

 
390

2013 Term Loan Facility
2,199

 
2,222

 
2,216

 
45

 
62

 
58

 
2,154

 
2,160

 
2,158

2014 Term Loan
494

 
499

 
498

 
11

 
14

 
13

 
483

 
485

 
485

Total debt, excluding capital leases and note payable
$
5,329

 
$
5,357

 
$
5,350

 
$
76

 
$
100

 
$
95

 
$
5,253

 
$
5,257

 
$
5,255

Less: current maturities
 
 
 
 
 
 
 
 
 
 
 
 
106

 
28

 
28

Total long-term debt, excluding capital leases and note payable

 

 

 
 
 
 
 

 
$
5,147

 
$
5,229

 
$
5,227


(1) These debt issuances contain change of control provisions that would obligate us, at the holders’ option, to repurchase the debt at a price equal to 101% of the principal amount of the debt.