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Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Millions
May 31, 2018
May 31, 2017
May 31, 2016
May 31, 2015
CURRENT ASSETS        
Cash and cash equivalents $ 3,265 $ 3,969 $ 3,534 $ 3,763
Receivables, less allowances 8,481 7,599    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 1,595 1,060    
Total current assets 13,341 12,628    
PROPERTY AND EQUIPMENT, AT COST 55,121 50,626    
Less accumulated depreciation and amortization 26,967 24,645    
Net property and equipment 28,154 25,981    
GOODWILL 6,973 7,154 6,747  
OTHER ASSETS 3,862 2,789    
ASSETS [1] 52,330 48,552 45,959  
CURRENT LIABILITIES        
Current portion of long-term debt 1,342 22    
Accrued salaries and employee benefits 2,177 1,914    
Accounts payable 2,977 2,752    
Accrued expenses 3,131 3,230    
Total current liabilities 9,627 7,918    
LONG-TERM DEBT, LESS CURRENT PORTION 15,243 14,909    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 2,867 2,485    
Other liabilities 5,177 7,167    
Total other long-term liabilities 8,044 9,652    
STOCKHOLDERS’ INVESTMENT 19,416 16,073 13,784 14,993
LIABILITIES AND STOCKHOLDERS' INVESTMENT 52,330 48,552    
Consolidation Eliminations [Member]        
CURRENT ASSETS        
Cash and cash equivalents (15) (47) (43) (78)
Receivables, less allowances (78) (61)    
Total current assets (93) (108)    
INTERCOMPANY RECEIVABLE (2,411) (4,128)    
INVESTMENT IN SUBSIDIARIES (37,452) (30,348)    
OTHER ASSETS 104 (3,225)    
ASSETS (39,852) (37,809)    
CURRENT LIABILITIES        
Accounts payable (90) (108)    
Accrued expenses (3)      
Total current liabilities (93) (108)    
INTERCOMPANY PAYABLE (2,411) (4,128)    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 104 (3,225)    
Total other long-term liabilities 104 (3,225)    
STOCKHOLDERS’ INVESTMENT (37,452) (30,348)    
LIABILITIES AND STOCKHOLDERS' INVESTMENT (39,852) (37,809)    
Parent Company [Member] | Reportable Legal Entities [Member]        
CURRENT ASSETS        
Cash and cash equivalents 1,485 1,884 1,974 2,383
Receivables, less allowances 3 3    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 425 25    
Total current assets 1,913 1,912    
PROPERTY AND EQUIPMENT, AT COST 21 22    
Less accumulated depreciation and amortization 17 18    
Net property and equipment 4 4    
INTERCOMPANY RECEIVABLE 1,487 1,521    
INVESTMENT IN SUBSIDIARIES 33,370 27,712    
OTHER ASSETS 75 3,494    
ASSETS 36,849 34,643    
CURRENT LIABILITIES        
Current portion of long-term debt 1,332      
Accrued salaries and employee benefits 65 72    
Accounts payable 16 10    
Accrued expenses 460 991    
Total current liabilities 1,873 1,073    
LONG-TERM DEBT, LESS CURRENT PORTION 14,942 14,641    
OTHER LONG-TERM LIABILITIES        
Other liabilities 619 2,856    
Total other long-term liabilities 619 2,856    
STOCKHOLDERS’ INVESTMENT 19,415 16,073    
LIABILITIES AND STOCKHOLDERS' INVESTMENT 36,849 34,643    
Guarantor Subsidiaries [Member[ | Reportable Legal Entities [Member]        
CURRENT ASSETS        
Cash and cash equivalents 257 325 326 487
Receivables, less allowances 4,970 4,729    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 878 787    
Total current assets 6,105 5,841    
PROPERTY AND EQUIPMENT, AT COST 51,232 47,201    
Less accumulated depreciation and amortization 25,111 23,211    
Net property and equipment 26,121 23,990    
INTERCOMPANY RECEIVABLE 924 2,607    
GOODWILL 1,709 1,571    
INVESTMENT IN SUBSIDIARIES 4,082 2,636    
OTHER ASSETS 1,854 1,271    
ASSETS 40,795 37,916    
CURRENT LIABILITIES        
Current portion of long-term debt 1 9    
Accrued salaries and employee benefits 1,506 1,335    
Accounts payable 1,332 1,411    
Accrued expenses 1,778 1,522    
Total current liabilities 4,617 4,277    
LONG-TERM DEBT, LESS CURRENT PORTION 288 244    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 2,626 5,472    
Other liabilities 3,432 3,448    
Total other long-term liabilities 6,058 8,920    
STOCKHOLDERS’ INVESTMENT 29,832 24,475    
LIABILITIES AND STOCKHOLDERS' INVESTMENT 40,795 37,916    
Non Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
CURRENT ASSETS        
Cash and cash equivalents 1,538 1,807 $ 1,277 $ 971
Receivables, less allowances 3,586 2,928    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 292 248    
Total current assets 5,416 4,983    
PROPERTY AND EQUIPMENT, AT COST 3,868 3,403    
Less accumulated depreciation and amortization 1,839 1,416    
Net property and equipment 2,029 1,987    
GOODWILL 5,264 5,583    
OTHER ASSETS 1,829 1,249    
ASSETS 14,538 13,802    
CURRENT LIABILITIES        
Current portion of long-term debt 9 13    
Accrued salaries and employee benefits 606 507    
Accounts payable 1,719 1,439    
Accrued expenses 896 717    
Total current liabilities 3,230 2,676    
LONG-TERM DEBT, LESS CURRENT PORTION 13 24    
INTERCOMPANY PAYABLE 2,411 4,128    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 137 238    
Other liabilities 1,126 863    
Total other long-term liabilities 1,263 1,101    
STOCKHOLDERS’ INVESTMENT 7,621 5,873    
LIABILITIES AND STOCKHOLDERS' INVESTMENT $ 14,538 $ 13,802    
[1] Segment assets include intercompany receivables.