Adoption of New Leasing Standard - Xerox as a Lessee Xerox as a Lessee (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Lessee, Operating Lease, Term of Contract		10 years
Operating Lease, Expense		$ 33
Short-term Lease, Cost		5
Variable Lease, Cost	[1]	13
Lease, Cost		51
Operating Lease, Right-of-Use Asset		341
Operating Lease, Liability, Current		97
Operating Lease, Liability, Noncurrent		265
Operating Lease, Liability		362
Operating Lease, Payments		32
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	[2]	$ 9
Operating Lease, Weighted Average Remaining Lease Term		4 years
Operating Lease, Weighted Average Discount Rate, Percent		5.64%
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	[3]	$ 92
Lessee, Operating Lease, Liability, Payments, Due Year Two		101
Lessee, Operating Lease, Liability, Payments, Due Year Three		77
Lessee, Operating Lease, Liability, Payments, Due Year Four		63
Lessee, Operating Lease, Liability, Payments, Due Year Five		47
Lessee, Operating Lease, Liability, Payments, Due after Year Five		28
Lessee, Operating Lease, Liability, Payments, Due		408
Lessee, Operating Lease, Liability, Undiscounted Excess Amount		46
Finance Lease, Liability		$ 8
Lessee, Finance Lease, Discount Rate		4.07%
Operating Leases, Rent Expense, Net			$ 147	$ 161
Operating Leases, Future Minimum Payments Due, Next Twelve Months			114
Operating Leases, Future Minimum Payments, Due in Two Years			88
Operating Leases, Future Minimum Payments, Due in Three Years			64
Operating Leases, Future Minimum Payments, Due in Four Years			50
Operating Leases, Future Minimum Payments, Due in Five Years			36
Operating Leases, Future Minimum Payments, Due Thereafter			27
Operating Leases, Future Minimum Payments Due			$ 379

[1] Variable lease expense is related to our leased real estate for offices and warehouses and primarily includes labor and operational costs as well as taxes and insurance.

[2] Includes the impact of new leases as well as remeasurements and modifications to existing leases.

[3] Represents the future minimum operating lease payments expected to be made over the remaining balance of the year.