Sale of Receivables (Details) - USD ($)	3 Months Ended	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2017	Jul. 14, 2017	Dec. 21, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable securitization facility, amount					$ 250,000,000
Total availability under the Receivables Facility			$ 199,000,000
Gain (loss) on sale of receivables		$ 0
Cash received upon sale of receivables			207,000,000
Deferred purchase price receivable	$ 242,000,000	252,000,000	272,000,000
Liability recorded due to maximum funding limit being exceeded			8,000,000
Purchase Agreement, maximum funding available				$ 200,000,000
Receivables sold			$ 486,000,000
Operating cash flow effect, net of collections and fees from sales	114,000,000
Cash collection by not remitted to the Financial Institutions	26,000,000
Transfer of Financial Assets Accounted for as Sales, Deferred Purchase Price [Roll Forward]
Beginning balance	242,000,000	252,000,000
Transfers of receivables	606,000,000	1,154,000,000
Collections	(579,000,000)	(1,124,000,000)
Fair value adjustment	3,000,000	(10,000,000)
Ending balance	272,000,000	$ 272,000,000
Financial Institution
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collection of receivables sold	$ 371,000,000