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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
12 Months Ended
May 31, 2020
May 31, 2019
May 31, 2018
OPERATING ACTIVITIES      
Net income $ 1,286 $ 540 $ 4,572
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization 3,615 3,353 3,095
Provision for uncollectible accounts 442 295 246
Other noncash items and deferred income taxes 2,449 (233) (231)
Stock-based compensation 168 174 167
Retirement plans mark-to-market adjustment 794 3,882 (10)
Gain from sale of business   (8) (85)
Business realignment costs   101  
Goodwill and other asset impairment charges 435   380
Changes in assets and liabilities:      
Receivables (1,331) (873) (1,049)
Other current assets (59) (25) (135)
Pension and postretirement healthcare assets and liabilities, net (908) (909) (2,345)
Accounts payable and other liabilities (1,787) (571) 141
Other, net (7) (113) (72)
Cash provided by operating activities 5,097 5,613 4,674
INVESTING ACTIVITIES      
Capital expenditures (5,868) (5,490) (5,663)
Business acquisitions, net of cash acquired   (66) (179)
Proceeds from sale of business     123
Proceeds from asset dispositions and other 22 83 42
Cash used in investing activities (5,846) (5,473) (5,677)
FINANCING ACTIVITIES      
Principal payments on debt (2,548) (1,436) (38)
Proceeds from debt issuances 6,556 2,463 1,480
Proceeds from stock issuances 64 101 327
Dividends paid (679) (683) (535)
Purchase of treasury stock (3) (1,480) (1,017)
Other, net (9) (4) 10
Cash provided by (used in) financing activities 3,381 (1,039) 227
Effect of exchange rate changes on cash (70) (47) 72
Net increase (decrease) in cash and cash equivalents 2,562 (946) (704)
Cash and cash equivalents at beginning of period 2,319 3,265 3,969
Cash and cash equivalents at end of period $ 4,881 $ 2,319 $ 3,265