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Leases (Future Minimum Lease Payments Under Non-Cancelable Operating Leases Net of Future Non-Cancelable Operating Sublease Payments) (Details)
$ in Millions
Jan. 28, 2017
USD ($)
Leases [Abstract]  
2017 $ 624
2018 581
2019 535
2020 495
2021 460
Thereafter 1,730
Total operating lease commitments $ 4,425