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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Operating Activities:    
Net income $ 2,156 $ 2,471
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 1,966 1,862
Provision for uncollectible accounts 211 291
Stock-based compensation 112 121
Retirement plans mark-to-market adjustments 260 52
Other noncash items including leases and deferred income taxes 1,713 1,482
Business realignment costs 55  
Changes in assets and liabilities:    
Receivables (519) (1,100)
Other assets (236) (56)
Accounts payable and other liabilities (1,582) 241
Other, net (54) (134)
Cash provided by operating activities 4,082 5,230
Investing Activities:    
Capital expenditures (3,143) (2,826)
Proceeds from asset dispositions and other 31 14
Cash used in investing activities (3,112) (2,812)
Financing Activities:    
Principal payments on debt (72) (75)
Proceeds from debt issuances   970
Proceeds from stock issuances 111 431
Dividends paid (400) (341)
Purchase of treasury stock (748)  
Other, net   (12)
Cash (used in) provided by financing activities (1,109) 973
Effect of exchange rate changes on cash (115) 67
Net (decrease) increase in cash and cash equivalents (254) 3,458
Cash and cash equivalents at beginning of period 7,087 4,881
Cash and cash equivalents at end of period $ 6,833 $ 8,339