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Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Millions
Feb. 28, 2018
May 31, 2017
Feb. 28, 2017
May 31, 2016
CURRENT ASSETS        
Cash and cash equivalents $ 2,789 $ 3,969 $ 3,173 $ 3,534
Receivables, less allowances 8,671 7,599    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 2,115 1,060    
Total current assets 13,575 12,628    
PROPERTY AND EQUIPMENT, AT COST 54,377 50,626    
Less accumulated depreciation and amortization 26,680 24,645    
Net property and equipment 27,697 25,981    
GOODWILL 7,464 7,154    
OTHER ASSETS 3,115 2,789    
ASSETS 51,851 48,552    
CURRENT LIABILITIES        
Short-term borrowings 799      
Current portion of long-term debt 764 22    
Accrued salaries and employee benefits 1,945 1,914    
Accounts payable 3,102 2,752    
Accrued expenses 2,893 3,230    
Total current liabilities 9,503 7,918    
LONG-TERM DEBT, LESS CURRENT PORTION 16,017 14,909    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 2,401 2,485    
Other liabilities 5,036 7,167    
Total other long-term liabilities 7,437 9,652    
STOCKHOLDERS’ INVESTMENT 18,894 16,073    
LIABILITIES AND STOCKHOLDERS' INVESTMENT 51,851 48,552    
Consolidation Eliminations [Member]        
CURRENT ASSETS        
Cash and cash equivalents (37) (47) (45) (43)
Receivables, less allowances (100) (61)    
Total current assets (137) (108)    
INTERCOMPANY RECEIVABLE (4,039) (4,128)    
INVESTMENT IN SUBSIDIARIES (34,223) (30,348)    
OTHER ASSETS (2,425) (3,225)    
ASSETS (40,824) (37,809)    
CURRENT LIABILITIES        
Accounts payable (137) (108)    
Total current liabilities (137) (108)    
INTERCOMPANY PAYABLE (4,039) (4,128)    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes (2,425) (3,225)    
Total other long-term liabilities (2,425) (3,225)    
STOCKHOLDERS’ INVESTMENT (34,223) (30,348)    
LIABILITIES AND STOCKHOLDERS' INVESTMENT (40,824) (37,809)    
Parent Company [Member] | Reportable Legal Entities [Member]        
CURRENT ASSETS        
Cash and cash equivalents 957 1,884 1,475 1,974
Receivables, less allowances 1 3    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 920 25    
Total current assets 1,878 1,912    
PROPERTY AND EQUIPMENT, AT COST 22 22    
Less accumulated depreciation and amortization 18 18    
Net property and equipment 4 4    
INTERCOMPANY RECEIVABLE 1,401 1,521    
INVESTMENT IN SUBSIDIARIES 31,295 27,712    
OTHER ASSETS 2,706 3,494    
ASSETS 37,284 34,643    
CURRENT LIABILITIES        
Short-term borrowings 799      
Current portion of long-term debt 750      
Accrued salaries and employee benefits 69 72    
Accounts payable 149 10    
Accrued expenses 379 991    
Total current liabilities 2,146 1,073    
LONG-TERM DEBT, LESS CURRENT PORTION 15,713 14,641    
OTHER LONG-TERM LIABILITIES        
Other liabilities 531 2,856    
Total other long-term liabilities 531 2,856    
STOCKHOLDERS’ INVESTMENT 18,894 16,073    
LIABILITIES AND STOCKHOLDERS' INVESTMENT 37,284 34,643    
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
CURRENT ASSETS        
Cash and cash equivalents 375 325 301 326
Receivables, less allowances 5,308 4,729    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 928 787    
Total current assets 6,611 5,841    
PROPERTY AND EQUIPMENT, AT COST 50,601 47,201    
Less accumulated depreciation and amortization 24,999 23,211    
Net property and equipment 25,602 23,990    
INTERCOMPANY RECEIVABLE 2,508 2,607    
GOODWILL 1,571 1,571    
INVESTMENT IN SUBSIDIARIES 2,928 2,636    
OTHER ASSETS 1,566 1,271    
ASSETS 40,786 37,916    
CURRENT LIABILITIES        
Current portion of long-term debt 6 9    
Accrued salaries and employee benefits 1,362 1,335    
Accounts payable 1,483 1,411    
Accrued expenses 1,605 1,522    
Total current liabilities 4,456 4,277    
LONG-TERM DEBT, LESS CURRENT PORTION 288 244    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 4,285 5,472    
Other liabilities 3,605 3,448    
Total other long-term liabilities 7,890 8,920    
STOCKHOLDERS’ INVESTMENT 28,152 24,475    
LIABILITIES AND STOCKHOLDERS' INVESTMENT 40,786 37,916    
Non Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
CURRENT ASSETS        
Cash and cash equivalents 1,494 1,807 $ 1,442 $ 1,277
Receivables, less allowances 3,462 2,928    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 267 248    
Total current assets 5,223 4,983    
PROPERTY AND EQUIPMENT, AT COST 3,754 3,403    
Less accumulated depreciation and amortization 1,663 1,416    
Net property and equipment 2,091 1,987    
INTERCOMPANY RECEIVABLE 130      
GOODWILL 5,893 5,583    
OTHER ASSETS 1,268 1,249    
ASSETS 14,605 13,802    
CURRENT LIABILITIES        
Current portion of long-term debt 8 13    
Accrued salaries and employee benefits 514 507    
Accounts payable 1,607 1,439    
Accrued expenses 909 717    
Total current liabilities 3,038 2,676    
LONG-TERM DEBT, LESS CURRENT PORTION 16 24    
INTERCOMPANY PAYABLE 4,039 4,128    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 541 238    
Other liabilities 900 863    
Total other long-term liabilities 1,441 1,101    
STOCKHOLDERS’ INVESTMENT 6,071 5,873    
LIABILITIES AND STOCKHOLDERS' INVESTMENT $ 14,605 $ 13,802