Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Cash flows from operating activities:
Net income	$ 349	$ 320
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	24	24
Stock-based compensation expense	6	5
Deferred income taxes	(6)	42
Changes in assets and liabilities	(172)	(226)
Cash provided by operating activities	201	165
Cash flows from investing activities:
Additions to property, plant, and equipment	(60)	(39)
Cash used for investing activities	(60)	(39)
Cash flows from financing activities:
Net increase in short-term borrowings	3	4
Repayment of long-term debt	(1)	(1)
Net payments related to exercise of stock-based awards	(6)	(10)
Excess tax benefits from stock-based awards	9	13
Acquisition of treasury stock	(49)	0
Dividends paid	(109)	(100)
Cash used for financing activities	(153)	(94)
Effect of exchange rate changes on cash and cash equivalents	0	(1)
Net increase (decrease) in cash and cash equivalents	(12)	31
Cash and cash equivalents, beginning of period	204	338
Cash and cash equivalents, end of period	$ 192	$ 369