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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Operating Activities:    
Net income $ 1,890 $ 1,944
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 1,964 1,954
Provision for uncollectible accounts 90 112
Stock-based compensation 115 106
Deferred income taxes and other noncash items 288 220
Changes in assets and liabilities:    
Receivables (78) (200)
Other assets (322) (38)
Accounts payable and other liabilities (146) (599)
Other, net (5) (26)
Cash provided by operating activities 3,796 3,473
Investing Activities:    
Capital expenditures (3,562) (2,969)
Business acquisitions, net of cash acquired   (1,429)
Asset dispositions and other, net (17) 16
Cash used in investing activities (3,579) (4,382)
Financing Activities:    
Principal payments on debt (28) (1)
Proceeds from debt issuances 1,238 2,491
Proceeds from stock issuances 79 272
Excess tax benefit on the exercise of stock options 9 31
Dividends paid (210) (171)
Purchases of treasury stock (2,133) (1,016)
Other, net (16) (23)
Cash (used in) provided by financing activities (1,061) 1,583
Effect of exchange rate changes on cash (78) (104)
Net (decrease) increase in cash and cash equivalents (922) 570
Cash and cash equivalents at beginning of period 3,763 2,908
Cash and cash equivalents at end of period $ 2,841 $ 3,478