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Legal Proceedings (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 18, 2018
Aug. 04, 2018
May 05, 2018
Aug. 04, 2018
Jun. 17, 2018
Feb. 03, 2018
Plan reformation cost   $ 2   $ 13    
Class counsel fees paid in connection with pension litigation       97    
Osberg Interest On Reformation [Member]            
Plan reformation cost   2   6    
Osberg Reformance Cost [Member]            
Plan reformation cost     $ 7      
Osberg V. Foot Locker, Inc [Member]            
Pension litigation liability   $ 194   $ 194 $ 291 $ 278
Class counsel fees paid in connection with pension litigation $ 97