Business and Summary of Significant Accounting Policies | Recently Issued Accounting Standards (Details) $ in Millions	Jan. 31, 2019 USD ($)
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 200
Operating Lease, Liability	200
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	250
Operating Lease, Liability	$ 250