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Related Party Balances and Transactions (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
California Foundation | Other accrued liabilities
Related Party Transaction [Line Items]
Pledge payable balance	$ 100		$ 100
Investee
Related Party Transaction [Line Items]
Revenue from related parties		$ 137	154	$ 112
Accounts receivable, related parties, current	15	$ 13	$ 15
Selling, Distribution and Administrative Expenses | California Foundation
Related Party Transaction [Line Items]
Pre-tax charitable contribution expense	100
After-tax charitable contribution expense	$ 64

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