Acquisitions |Adjustments to Estimated Purchase Price Allocation (Details) - TS $ in Millions	3 Months Ended
	Jul. 31, 2017 USD ($)
Adjustments to Purchase Price Allocation [Line Items]
Goodwill, Translation and Purchase Accounting Adjustments	$ 123
Finite-Lived Intangible Assets, Translation and Purchase Accounting Adjustments	94
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current Assets	15
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets	$ 14