Accounts Receivable Facility (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Nov. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Receivables Facility, maximum amount available based on receivables sold to investors, percent	50.00%
Document Period End Date	Jun. 30, 2016
Deferred purchase price from sale of receivables	$ (117)	$ 1,184
cash paid to purchasers under receivables facility	185
Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Cash received for sale of receivables under receivables facility	40
Cash Flows Between Transferor and Transferee, Proceeds from Collections Reinvested in Revolving Period Transfers	28
Accounts Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Maximum Funding Limit			$ 4,300
Receivables Facility, Amount of Funds Available	36
Deferred purchase price from sale of receivables	$ 1,300