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Long-term Debt (Schedule Of Long-term Debt Instruments) (Details) - USD ($)
$ in Millions
Oct. 31, 2015
Jan. 31, 2015
Nov. 01, 2014
Senior Unsecured Debt with Subsidiary Guarantee $ 4,401 $ 3,401 $ 3,395
Other Borrowings 5 0 0
Unsecured Debt 1,365 1,364 1,577
Debt, Current 4 0 213
Debt, Long-term and Short-term, Combined Amount 5,766 4,765 4,972
Total Long-term Debt, Net of Current Portion 5,762 4,765 4,759
Fixed Rate 6.875% Notes Due November 2035 [Member]      
Senior Unsecured Debt with Subsidiary Guarantee 1,000 0 0
Long-term Debt, Gross 1,000    
Fixed Rate 5.625% Notes Due February 2022 [Member]      
Senior Unsecured Debt with Subsidiary Guarantee 1,000 1,000 1,000
Fixed Rate 6.625% Notes Due April 2021 [Member]      
Senior Unsecured Debt with Subsidiary Guarantee 1,000 1,000 1,000
Fixed Rate 5.625% Notes Due October 2023 [Member]      
Senior Unsecured Debt with Subsidiary Guarantee 500 500 500
Fixed Rate 8.50% Notes Due June 2019 [Member]      
Senior Unsecured Debt with Subsidiary Guarantee [1] 501 501 495
Fair Value Interest Rate Hedge Adjustment 7 8 3
Fixed Rate 7.00% Notes Due May 2020 [Member]      
Senior Unsecured Debt with Subsidiary Guarantee 400 400 400
Fixed Rate 6.90% Notes Due July 2017 [Member]      
Senior Unsecured Debt [2] 711 715 715
Fair Value Interest Rate Hedge Adjustment 11 15 15
Fixed Rate 6.95% Debentures Due March 2033 [Member]      
Senior Unsecured Debt 350 350 350
Fixed Rate 7.60% Notes Due July 2037 [Member]      
Senior Unsecured Debt 299 299 299
Fixed Rate 5.25% Notes Due November 2014 [Member]      
Senior Unsecured Debt $ 0 $ 0 $ 213
[1] The balances include a fair value interest rate hedge adjustment which increased the debt balance by $7 million as of October 31, 2015, $8 million as of January 31, 2015 and $3 million as of November 1, 2014.
[2] The balances include a fair value interest rate hedge adjustment which increased the debt balance by $11 million as of October 31, 2015 and $15 million as of January 31, 2015 and November 1, 2014.