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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Operating Activities:    
Net income $ 3,445 $ 1,977
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 2,293 2,241
Provision for uncollectible accounts 177 115
Stock-based compensation 135 123
Deferred income taxes and other noncash items (914) 474
Gain from sale of investment   (35)
Changes in assets and liabilities:    
Receivables (986) (340)
Other assets (151) (235)
Accounts payable and other liabilities (2,781) (1,642)
Other, net (56) (33)
Cash provided by operating activities 1,162 2,645
Investing Activities:    
Capital expenditures (3,994) (3,790)
Business acquisitions, net of cash acquired (44)  
Proceeds from asset dispositions and other 21 123
Cash used in investing activities (4,017) (3,667)
Financing Activities:    
Proceeds from short-term borrowings, net 797  
Principal payments on debt (31) (49)
Proceeds from debt issuances 1,481 1,190
Proceeds from stock issuances 284 265
Dividends paid (402) (319)
Purchase of treasury stock (558) (358)
Other, net 6 2
Cash provided by financing activities 1,577 731
Effect of exchange rate changes on cash 98 (70)
Net decrease in cash and cash equivalents (1,180) (361)
Cash and cash equivalents at beginning of period 3,969 3,534
Cash and cash equivalents at end of period $ 2,789 $ 3,173