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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Operating Activities:    
Net income $ 2,471 $ 1,305
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 1,862 1,780
Asset impairment charges   66
Provision for uncollectible accounts 291 208
Stock-based compensation 121 104
Retirement plan mark-to-market adjustment 52  
Other noncash items and deferred income taxes 1,482 1,164
Changes in assets and liabilities:    
Receivables (1,100) (684)
Other assets (56) (162)
Accounts payable and other liabilities 241 (1,691)
Other, net (134) (16)
Cash provided by operating activities 5,230 2,074
Investing Activities:    
Capital expenditures (2,826) (3,266)
Proceeds from asset dispositions and other 14 4
Cash used in investing activities (2,812) (3,262)
Financing Activities:    
Proceeds from short-term borrowings, net   150
Principal payments on debt (75) (1,021)
Proceeds from debt issuances 970 2,093
Proceeds from stock issuances 431 26
Dividends paid (341) (339)
Purchase of treasury stock   (3)
Other, net (12) (5)
Cash provided by financing activities 973 901
Effect of exchange rate changes on cash 67 (1)
Net increase (decrease) in cash and cash equivalents 3,458 (288)
Cash and cash equivalents at beginning of period 4,881 2,319
Cash and cash equivalents at end of period $ 8,339 $ 2,031