Property and Equipment (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	$ 500	$ 516
Less: accumulated depreciation and amortization	(193)	(148)
Property and equipment, net	307	368
Land, buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	32	58
Computers and related equipment
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	412	409
Furniture and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	$ 56	$ 49