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Acquisitions - Fiscal 2018 Acquisitions (Details) - USD ($) $ in Millions	Jul. 01, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 7,606	$ 7,619	$ 1,855
Tribridge Holdings LLC
Business Acquisition [Line Items]
Total consideration transferred	$ 152
Current assets acquired	32
Property and equipment	4
Intangible assets, other than goodwill	62
Current liabilities	24
Goodwill	$ 78
Useful lives (years)	12 years