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Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Millions
Aug. 31, 2018
May 31, 2018
Aug. 31, 2017
May 31, 2017
CURRENT ASSETS        
Cash and cash equivalents $ 2,369 $ 3,265 $ 3,503 $ 3,969
Receivables, less allowances 8,716 8,481    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 1,556 1,595    
Total current assets 12,641 13,341    
PROPERTY AND EQUIPMENT, AT COST 56,326 55,121    
Less accumulated depreciation and amortization 27,547 26,967    
Net property and equipment 28,779 28,154    
GOODWILL 6,869 6,973    
OTHER ASSETS 3,612 3,862    
ASSETS 51,901 52,330    
CURRENT LIABILITIES        
Short-term borrowings 299      
Current portion of long-term debt 1,404 1,342    
Accrued salaries and employee benefits 1,686 2,177    
Accounts payable 3,066 2,977    
Accrued expenses 3,151 3,131    
Total current liabilities 9,606 9,627    
LONG-TERM DEBT, LESS CURRENT PORTION 15,241 15,243    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 2,948 2,867    
Other liabilities 4,933 5,177    
Total other long-term liabilities 7,881 8,044    
STOCKHOLDERS’ INVESTMENT 19,173 19,416    
LIABILITIES AND STOCKHOLDERS' INVESTMENT 51,901 52,330    
Consolidation Eliminations [Member]        
CURRENT ASSETS        
Cash and cash equivalents (42) (15) (40) (47)
Receivables, less allowances (108) (78)    
Total current assets (150) (93)    
INTERCOMPANY RECEIVABLE (2,625) (2,411)    
INVESTMENT IN SUBSIDIARIES (38,905) (37,452)    
OTHER ASSETS   104    
ASSETS (41,680) (39,852)    
CURRENT LIABILITIES        
Accounts payable (151) (90)    
Accrued expenses   (3)    
Total current liabilities (151) (93)    
INTERCOMPANY PAYABLE (2,624) (2,411)    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes   104    
Total other long-term liabilities   104    
STOCKHOLDERS’ INVESTMENT (38,905) (37,452)    
LIABILITIES AND STOCKHOLDERS' INVESTMENT (41,680) (39,852)    
Parent Company [Member] | Reportable Legal Entities [Member]        
CURRENT ASSETS        
Cash and cash equivalents 938 1,485 1,681 1,884
Receivables, less allowances 41 3    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 285 425    
Total current assets 1,264 1,913    
PROPERTY AND EQUIPMENT, AT COST 21 21    
Less accumulated depreciation and amortization 17 17    
Net property and equipment 4 4    
INTERCOMPANY RECEIVABLE 1,385 1,487    
INVESTMENT IN SUBSIDIARIES 34,038 33,370    
OTHER ASSETS 241 75    
ASSETS 36,932 36,849    
CURRENT LIABILITIES        
Short-term borrowings 299      
Current portion of long-term debt 1,332 1,332    
Accrued salaries and employee benefits 43 65    
Accounts payable 187 16    
Accrued expenses 466 460    
Total current liabilities 2,327 1,873    
LONG-TERM DEBT, LESS CURRENT PORTION 14,942 14,942    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 101      
Other liabilities 389 619    
Total other long-term liabilities 490 619    
STOCKHOLDERS’ INVESTMENT 19,173 19,415    
LIABILITIES AND STOCKHOLDERS' INVESTMENT 36,932 36,849    
Guarantor Subsidiaries [Member[ | Reportable Legal Entities [Member]        
CURRENT ASSETS        
Cash and cash equivalents 180 257 343 325
Receivables, less allowances 5,233 4,970    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 993 878    
Total current assets 6,406 6,105    
PROPERTY AND EQUIPMENT, AT COST 52,339 51,232    
Less accumulated depreciation and amortization 25,670 25,111    
Net property and equipment 26,669 26,121    
INTERCOMPANY RECEIVABLE 1,240 924    
GOODWILL 1,589 1,709    
INVESTMENT IN SUBSIDIARIES 4,867 4,082    
OTHER ASSETS 1,591 1,854    
ASSETS 42,362 40,795    
CURRENT LIABILITIES        
Current portion of long-term debt 65 1    
Accrued salaries and employee benefits 1,102 1,506    
Accounts payable 1,252 1,332    
Accrued expenses 1,786 1,778    
Total current liabilities 4,205 4,617    
LONG-TERM DEBT, LESS CURRENT PORTION 288 288    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 2,730 2,626    
Other liabilities 3,613 3,432    
Total other long-term liabilities 6,343 6,058    
STOCKHOLDERS’ INVESTMENT 31,526 29,832    
LIABILITIES AND STOCKHOLDERS' INVESTMENT 42,362 40,795    
Non Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
CURRENT ASSETS        
Cash and cash equivalents 1,293 1,538 $ 1,519 $ 1,807
Receivables, less allowances 3,550 3,586    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 278 292    
Total current assets 5,121 5,416    
PROPERTY AND EQUIPMENT, AT COST 3,966 3,868    
Less accumulated depreciation and amortization 1,860 1,839    
Net property and equipment 2,106 2,029    
GOODWILL 5,280 5,264    
OTHER ASSETS 1,780 1,829    
ASSETS 14,287 14,538    
CURRENT LIABILITIES        
Current portion of long-term debt 7 9    
Accrued salaries and employee benefits 541 606    
Accounts payable 1,778 1,719    
Accrued expenses 899 896    
Total current liabilities 3,225 3,230    
LONG-TERM DEBT, LESS CURRENT PORTION 11 13    
INTERCOMPANY PAYABLE 2,624 2,411    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 117 137    
Other liabilities 931 1,126    
Total other long-term liabilities 1,048 1,263    
STOCKHOLDERS’ INVESTMENT 7,379 7,621    
LIABILITIES AND STOCKHOLDERS' INVESTMENT $ 14,287 $ 14,538