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Fair Value Measurements (Tables)
 9 Months Ended
Oct. 31, 2015
Fair Value Disclosures [Abstract]  
Financial Assets And Liabilities Measured At Fair Value On Recurring Basis
Financial assets and liabilities measured at fair value on a recurring basis and cash equivalents are as follows:
 
 
 
Fair Value Measurements at Reporting Date Using
($ in millions)
October 31, 2015
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
 
Significant Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
Cash equivalents
$
174

 
$
62

 
$
112

 
$
—

Derivative financial instruments
84

 
—

 
84

 
—

Deferred compensation plan assets
41

 
41

 
—

 
—

Total
$
299

 
$
103

 
$
196

 
$
—

Liabilities:
 
 
 
 
 
 
 
Derivative financial instruments
$
8

 
$
—

 
$
8

 
$
—

 
 
 
Fair Value Measurements at Reporting Date Using
($ in millions)
January 31, 2015
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
 
Significant Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
Cash equivalents
$
429

 
$
88

 
$
341

 
$
—

Derivative financial instruments
157

 
—

 
157

 
—

Deferred compensation plan assets
40

 
40

 
—

 
—

Total
$
626

 
$
128

 
$
498

 
$
—

Liabilities:
 
 
 
 
 
 
 
Derivative financial instruments
$
1

 
$
—

 
$
1

 
$
—

 
 
 
Fair Value Measurements at Reporting Date Using
($ in millions)
November 1, 2014
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
 
Significant  Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
Cash equivalents
$
241

 
$
29

 
$
212

 
$
—

Derivative financial instruments
98

 
—

 
98

 
—

Deferred compensation plan assets
40

 
40

 
—

 
—

Total
$
379

 
$
69

 
$
310

 
$
—

Liabilities:
 
 
 
 
 
 
 
Derivative financial instruments
$
2

 
$
—

 
$
2

 
$
—