Long-Term Debt (Annual Principal Payments) (Details) - USD ($)
$ in Millions
Jan. 30, 2016
Jan. 31, 2015
Debt Disclosure [Abstract]    
2015 $ 101  
2016 243  
2017 2,449  
2018 400  
2019 400  
Thereafter 1,237  
Total $ 4,830 $ 5,350