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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Operating Activities:    
Net income $ 1,415 $ 1,383
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 1,479 1,301
Provision for uncollectible accounts 76 57
Stock-based compensation 93 86
Deferred income taxes and other noncash items 320 (48)
Gain from sale of investment (35)  
Changes in assets and liabilities:    
Receivables (513) (263)
Other assets (250) (113)
Accounts payable and other liabilities 67 66
Other, net (17) (15)
Cash provided by operating activities 2,635 2,454
Investing Activities:    
Capital expenditures (2,681) (2,562)
Proceeds from asset dispositions and other 100 12
Cash used in investing activities (2,581) (2,550)
Financing Activities:    
Principal payments on debt (43) (17)
Proceeds from debt issuance   1,238
Proceeds from stock issuances 164 62
Dividends paid (213) (141)
Purchases of treasury stock (334) (1,101)
Other, net (5) (8)
Cash (used in) provided by financing activities (431) 33
Effect of exchange rate changes on cash (98) (53)
Net decrease in cash and cash equivalents (475) (116)
Cash and cash equivalents at beginning of period 3,534 3,763
Cash and cash equivalents at end of period $ 3,059 $ 3,647