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Debt (Tables)
 9 Months Ended
Oct. 31, 2015
Debt Disclosure [Abstract]  
Components of long-term debt
Long-term debt, which excludes draws on revolving credit facilities, consists of the following unsecured senior debt:
 
October 31, 2015
 
Outstanding
Maturity
Effective
Rate
 
Coupon Rate
 
Outstanding
 
January 31, 2015
 
November 1, 2014
 
 
 
 
 
(Dollars in Millions)
2021
4.81
%
 
4.00
%
 
$
650

 
$
650

 
$
650

2023
3.25
%
 
3.25
%
 
350

 
350

 
350

2023
4.78
%
 
4.75
%
 
300

 
300

 
300

2025
4.25
%
 
4.25
%
 
650

 
—

 
—

2029
7.36
%
 
7.25
%
 
99

 
200

 
200

2033
6.05
%
 
6.00
%
 
166

 
300

 
300

2037
6.89
%
 
6.88
%
 
150

 
350

 
350

2045
5.57
%
 
5.55
%
 
450

 
—

 
—

2017
—

 
—

 
—

 
650

 
650

 
4.88
%
 
 
 
2,815

 
2,800

 
2,800

Unamortized debt discount
(5
)
 
(7
)
 
(7
)
Deferred financing costs
(18
)
 
(13
)
 
(14
)
Long-term debt
$
2,792

 
$
2,780

 
$
2,779