Restructuring and Asset Impairment Charges - Summary of Details for Charges Recorded (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net			$ 207
Exit-related costs			5
Asset impairments and accelerated depreciation and amortization			17
Total	$ 13	$ 14	229
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Total			26
Operating Expenses
Restructuring Cost and Reserve [Line Items]
Total			203
Operating Segments | Distribution Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net			147
Exit-related costs			3
Asset impairments and accelerated depreciation and amortization			11
Total	13	19	161
Operating Segments | Distribution Solutions | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Total			5
Operating Segments | Distribution Solutions | Operating Expenses
Restructuring Cost and Reserve [Line Items]
Total			156
Operating Segments | Technology Solutions
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net			44
Exit-related costs			1
Asset impairments and accelerated depreciation and amortization			6
Total	0	(10)	51
Operating Segments | Technology Solutions | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Total			21
Operating Segments | Technology Solutions | Operating Expenses
Restructuring Cost and Reserve [Line Items]
Total			30
Corporate
Restructuring Cost and Reserve [Line Items]
Severance and employee-related costs, net			16
Exit-related costs			1
Asset impairments and accelerated depreciation and amortization			0
Total	$ 0	$ 5	17
Corporate | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Total			0
Corporate | Operating Expenses
Restructuring Cost and Reserve [Line Items]
Total			$ 17