Related Party Transactions and Parent Company Investment - Summary of Net Transfers from Parent on the Condensed Combined Statements of Equity (Detail) - USD ($) $ in Millions		3 Months Ended
		Jan. 31, 2017	Jan. 31, 2016
Related Party Transaction [Line Items]
Total net transfers from Parent per Condensed Combined Statements of Equity		$ 3,308	$ 691
Parent Company [Member]
Related Party Transaction [Line Items]
Intercompany revenue		(13)	(8)
Intercompany purchases		184	188
Cash pooling and general financing activities	[1]	2,598	202
Corporate allocations		386	409
Income taxes		(20)	(35)
Defined benefit plans transferred to Parent		224
Defined benefit plans transferred from Parent		(48)
Cash transfers (to) from Parent for business divestitures and other, net		(3)	(65)
Total net transfers from Parent per Condensed Combined Statements of Equity		$ 3,308	$ 691

[1] Activity for the three months ended January 31, 2017 includes approximately $1.9 billion of pension funding payments pursuant to the Transaction agreement between Parent and CSC as discussed in Note 4, "Retirement and Post-Retirement Benefit Plans."