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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
OPERATING ACTIVITIES      
Net income $ 540 $ 4,572 $ 2,997
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization 3,353 3,095 2,995
Provision for uncollectible accounts 295 246 136
Deferred income taxes and other noncash items (233) (231) 909
Stock-based compensation 174 167 154
Retirement plans mark-to-market adjustment 3,882 (10) (24)
Gain from sale of business (8) (85)  
Gain from sale of investment     (35)
Business realignment costs 101    
Goodwill and other asset impairment charges   380  
Changes in assets and liabilities:      
Receivables (873) (1,049) (556)
Other current assets (25) (135) 78
Pension and postretirement healthcare assets and liabilities, net (909) (2,345) (1,688)
Accounts payable and other liabilities (571) 141 103
Other, net (113) (72) (139)
Cash provided by operating activities 5,613 4,674 4,930
INVESTING ACTIVITIES      
Capital expenditures (5,490) (5,663) (5,116)
Business acquisitions, net of cash acquired (66) (179)  
Proceeds from sale of business   123  
Proceeds from asset dispositions and other 83 42 135
Cash used in investing activities (5,473) (5,677) (4,981)
FINANCING ACTIVITIES      
Principal payments on debt (1,436) (38) (82)
Proceeds from debt issuances 2,463 1,480 1,190
Proceeds from stock issuances 101 327 337
Dividends paid (683) (535) (426)
Purchase of treasury stock (1,480) (1,017) (509)
Other, net (4) 10 18
Cash (used in) provided by financing activities (1,039) 227 528
Effect of exchange rate changes on cash (47) 72 (42)
Net (decrease) increase in cash and cash equivalents (946) (704) 435
Cash and cash equivalents at beginning of period 3,265 3,969 3,534
Cash and cash equivalents at end of period $ 2,319 $ 3,265 $ 3,969