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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Cash flows from operating activities:    
Net income $ 1,832 $ 1,747
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 222 219
Amortization of intangible assets 311 452
Deferred income taxes 145 (30)
Stock-based compensation 319 253
Tax benefits on the vesting of restricted stock-based awards and exercise of stock options 215 102
Other, net 39 45
Changes in operating assets and liabilities, net of effects from acquisitions:    
Decrease in trade receivables, net 1,993 2,150
(Increase) decrease in inventories (75) 50
Decrease in prepaid expenses and other assets 435 379
Decrease in accounts payable and other liabilities (1,013) (1,353)
Decrease in income taxes payable (309) (204)
Increase in deferred revenues 1,761 2,071
Net cash provided by operating activities 5,875 5,881
Cash flows from investing activities:    
Purchases of marketable securities and other investments (5,513) (11,669)
Proceeds from maturities and sales of marketable securities and other investments 1,752 4,644
Acquisitions, net of cash acquired (1,143) 0
Capital expenditures (299) (446)
Net cash used for investing activities (5,203) (7,471)
Cash flows from financing activities:    
Payments for repurchases of common stock (2,002) (2,846)
Proceeds from issuances of common stock 487 296
Shares repurchased for tax withholdings upon vesting of restricted stock-based awards (170) (70)
Payments of dividends to stockholders (618) (650)
Proceeds from borrowings, net of issuance costs 13,932 0
Repayments of borrowings (3,750) 0
Distributions to noncontrolling interests (167) (25)
Net cash provided by (used for) financing activities 7,712 (3,295)
Effect of exchange rate changes on cash and cash equivalents 78 (92)
Net increase (decrease) in cash and cash equivalents 8,462 (4,977)
Cash and cash equivalents at beginning of period 20,152 21,716
Cash and cash equivalents at end of period 28,614 16,739
Non-cash investing and financing transactions:    
Fair values of restricted stock-based awards and stock options assumed in connection with acquisitions 6 0
(Decrease) increase in unsettled repurchases of common stock (3) 185
Decrease in unsettled investment purchases $ (95) $ (342)