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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
12 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
OPERATING ACTIVITIES      
Net income $ 3,826 $ 5,231 $ 1,286
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization 3,970 3,793 3,615
Provision for uncollectible accounts 403 577 442
Other noncash items including leases and deferred income tax 2,931 2,887 2,449
Stock-based compensation 190 200 168
Retirement plans mark-to-market adjustments 1,578 (1,176) 794
Loss on extinguishment of debt   393  
Business realignment costs 53 102  
Goodwill and other asset impairment charges     435
Changes in assets and liabilities:      
Receivables (310) (1,389) (1,331)
Other current assets (158) (40) (59)
Pension and postretirement healthcare assets and liabilities, net (697) (317) (908)
Accounts payable and other liabilities (1,861) 71 (1,787)
Other, net (93) (197) (7)
Cash provided by operating activities 9,832 10,135 5,097
INVESTING ACTIVITIES      
Capital expenditures (6,763) (5,884) (5,868)
Business acquisitions, net of cash acquired   (228)  
Purchase of investments (147)    
Proceeds from asset dispositions and other 94 102 22
Cash used in investing activities (6,816) (6,010) (5,846)
FINANCING ACTIVITIES      
Principal payments on debt (161) (6,318) (2,548)
Proceeds from debt issuances   4,212 6,556
Proceeds from stock issuances 184 740 64
Dividends paid (793) (686) (679)
Purchase of treasury stock (2,248)   (3)
Other, net (1) (38) (9)
Cash (used in) provided by financing activities (3,019) (2,090) 3,381
Effect of exchange rate changes on cash (187) 171 (70)
Net increase (decrease) in cash and cash equivalents (190) 2,206 2,562
Cash and cash equivalents at beginning of period 7,087 4,881 2,319
Cash and cash equivalents at end of period $ 6,897 $ 7,087 $ 4,881