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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Operating Activities:    
Net income $ 745 $ 835
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 879 808
Provision for uncollectible accounts 105 82
Stock-based compensation 67 68
Deferred income taxes and other noncash items 694 23
Changes in assets and liabilities:    
Receivables (267) (380)
Other assets (118) (120)
Accounts payable and other liabilities (1,537) (584)
Other, net (3) (31)
Cash provided by operating activities 565 701
Investing Activities:    
Capital expenditures (1,418) (1,179)
Proceeds from asset dispositions and other (1) 78
Cash used in investing activities (1,419) (1,101)
Financing Activities:    
Proceeds from short-term borrowings, net   299
Principal payments on debt (985) (2)
Proceeds from debt issuances 2,093  
Proceeds from stock issuances 12 25
Dividends paid (170) (173)
Purchase of treasury stock (3) (625)
Other, net (5) 4
Cash provided by (used in) financing activities 942 (472)
Effect of exchange rate changes on cash (18) (24)
Net increase (decrease) in cash and cash equivalents 70 (896)
Cash and cash equivalents at beginning of period 2,319 3,265
Cash and cash equivalents at end of period $ 2,389 $ 2,369