Fair Value Disclosures (Tables)
 6 Months Ended
Aug. 01, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
 
Cash Flow Hedges at Fair Value
($ in millions)
Quoted Prices in Active Markets of Identical Assets (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs (Level 3)
August 1, 2015
$
—

 
$
(11
)
 
$
—

August 2, 2014
—

 
—

 
—

January 31, 2015
—

 
—

 
—
Financial Instruments Not Carried at Fair Value, Carrying Value and Fair Value
Carrying values and fair values of financial instruments that are not carried at fair value in the unaudited Interim Consolidated Balance Sheets are as follows:
 
 
August 1, 2015
 
August 2, 2014
 
January 31, 2015
($ in millions)
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Long-term debt, excluding unamortized debt issuance costs, including current maturities
$
5,336

 
$
5,002

 
$
5,351

 
$
5,072

 
$
5,350

 
$
4,834