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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Operating Activities:    
Net income $ 824 $ 794
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 1,092 1,078
Provision for uncollectible accounts 219 129
Other noncash items including leases and deferred income taxes 718 817
Stock-based compensation 56 48
Separation and other costs, net of payments 27 0
Business optimization costs, net of payments (110) (69)
Changes in assets and liabilities:    
Receivables (336) (305)
Other assets (160) (223)
Accounts payable and other liabilities (571) (1,105)
Other, net (43) 23
Cash provided by operating activities 1,716 1,187
Investing Activities:    
Capital expenditures (623) (767)
Purchase of investments (34) (61)
Proceeds from sale of investments 30 13
Proceeds from asset dispositions and other investing activities, net 8 13
Cash used in investing activities (619) (802)
Financing Activities:    
Proceeds from debt issuances 997 0
Principal payments on debt (625) (34)
Proceeds from stock issuances 18 404
Dividends paid (345) (339)
Purchases of common stock (500) (1,000)
Other (5) 0
Cash used in financing activities (460) (969)
Effect of exchange rate changes on cash 27 26
Net increase (decrease) in cash and cash equivalents 664 (558)
Cash and cash equivalents at beginning of period 5,502 6,501
Cash and cash equivalents at end of period $ 6,166 $ 5,943