Related Party Transactions and Former Parent Company Investment (Details) $ in Millions			1 Months Ended	12 Months Ended
	Apr. 01, 2017 segment	Mar. 31, 2017 segment	Dec. 31, 2015 USD ($)	Oct. 31, 2017 segment	Oct. 31, 2015 USD ($)
Related Party Transactions
Agreement term				5 years
Number of reportable segments | segment	4	5		3
HP Inc
Related Party Transactions
Cash allocation from HP Inc.			$ 526
HP Inc | Intercompany Purchases
Related Party Transactions
Net transfers from former Parent					$ 1,300