Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	3 Months Ended
	May 04, 2019 USD ($)
Number of states in which entity operates	43
Increase of Net Right of Use Asset	$ 2,516
Increase in Net Lease Liability	2,728
Cumulative Effect of New Accounting Principle, Before Tax Impact, in Period of Adoption	212
Cumulative Effect of New Accounting Principle, Tax Impact, in Period of Adoption	$ 54