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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Millions
 9 Months Ended
Jan. 27, 2017
Jan. 29, 2016
Cash flows from operating activities:    
Net income $ 319 $ 237
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 173 202
Stock-based compensation 149 199
Deferred income taxes 73 (104)
Gain on sale of properties (10) 0
Other items, net (8) 30
Changes in assets and liabilities:    
Accounts receivable 208 190
Inventories (27) 44
Other operating assets 16 82
Accounts payable 13 (113)
Accrued expenses (121) (78)
Deferred revenue and financed unearned services revenue (148) (52)
Other operating liabilities (16) (8)
Net cash provided by operating activities 621 629
Cash flows from investing activities:    
Purchases of investments (1,383) (1,169)
Maturities, sales and collections of investments 1,385 2,048
Purchases of property and equipment (137) (125)
Other investing activities, net 2 (1)
Net cash provided by (used in) investing activities (133) 753
Cash flows from financing activities:    
Issuance of common stock under employee stock award plans 70 70
Repurchase of common stock (576) (698)
Changes in commercial paper notes, net 392 0
Repayment of short-term loan (850) 0
Dividends paid (157) (159)
Other financing activities, net (7) (3)
Net cash used in financing activities (1,128) (790)
Effect of exchange rate changes on cash and cash equivalents (15) (19)
Net increase (decrease) in cash and cash equivalents (655) 573
Cash and cash equivalents:    
Beginning of period 2,868 1,922
End of period $ 2,213 $ 2,495