Long-Term Debt (Annual Principal Payments) (Details) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2015
Feb. 01, 2014
Debt Disclosure [Abstract]    
2015 $ 28  
2016 106  
2017 248  
2018 2,454  
2019 878  
Thereafter 1,636  
Total $ 5,350 $ 4,862