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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
OPERATING ACTIVITIES      
Net income $ 4,572 $ 2,997 $ 1,820
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization 3,095 2,995 2,631
Provision for uncollectible accounts 246 136 121
Deferred income taxes and other noncash items (231) 909 31
Stock-based compensation 167 154 144
Retirement plans mark-to-market adjustment (10) (24) 1,498
Gain from sale of business (85)    
Gain from sale of investment   (35)  
Goodwill and other asset impairment charges 380    
Changes in assets and liabilities:      
Receivables (1,049) (556) (199)
Other current assets (135) 78 (234)
Pension and postretirement healthcare assets and liabilities, net (2,345) (1,688) (346)
Accounts payable and other liabilities 141 103 467
Other, net (72) (139) (225)
Cash provided by operating activities 4,674 4,930 5,708
INVESTING ACTIVITIES      
Capital expenditures (5,663) (5,116) (4,818)
Business acquisitions, net of cash acquired (179)   (4,618)
Proceeds from sale of business 123    
Proceeds from asset dispositions and other 42 135 (10)
Cash used in investing activities (5,677) (4,981) (9,446)
FINANCING ACTIVITIES      
Principal payments on debt (38) (82) (41)
Proceeds from debt issuances 1,480 1,190 6,519
Proceeds from stock issuances 327 337 183
Dividends paid (535) (426) (277)
Purchase of treasury stock (1,017) (509) (2,722)
Other, net 10 18 (51)
Cash provided by financing activities 227 528 3,611
Effect of exchange rate changes on cash 72 (42) (102)
Net (decrease) increase in cash and cash equivalents (704) 435 (229)
Cash and cash equivalents at beginning of period 3,969 3,534 3,763
Cash and cash equivalents at end of period $ 3,265 $ 3,969 $ 3,534