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Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Millions
Feb. 28, 2017
May 31, 2016
Feb. 29, 2016
May 31, 2015
CURRENT ASSETS        
Cash and cash equivalents $ 3,173 $ 3,534 $ 2,841 $ 3,763
Receivables, less allowances 7,418 7,252    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 1,347 1,203    
Total current assets 11,938 11,989    
PROPERTY AND EQUIPMENT, AT COST 49,752 47,018    
Less accumulated depreciation and amortization 24,139 22,734    
Net property and equipment 25,613 24,284    
Goodwill 7,000 6,747    
Other assets 2,230 2,939    
ASSETS 46,781 45,959    
CURRENT LIABILITIES        
Current portion of long-term debt 45 29    
Accrued salaries and employee benefits 1,690 1,972    
Accounts payable 2,707 2,944    
Accrued expenses 3,008 3,063    
Total current liabilities 7,450 8,008    
LONG-TERM DEBT, LESS CURRENT PORTION 14,713 13,733    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 2,299 1,567    
Other liabilities 7,135 8,867    
Total other long-term liabilities 9,434 10,434    
STOCKHOLDERS’ INVESTMENT 15,184 13,784    
LIABILITIES AND STOCKHOLDERS' INVESTMENT 46,781 45,959    
Consolidation Eliminations Member        
CURRENT ASSETS        
Cash and cash equivalents (45) (43) (32) (78)
Receivables, less allowances (43) (41)    
Total current assets (88) (84)    
INTERCOMPANY RECEIVABLE (3,658) (3,721)    
INVESTMENT IN SUBSIDIARIES (29,381) (28,463)    
Other assets (2,896) (3,238)    
ASSETS (36,023) (35,506)    
CURRENT LIABILITIES        
Accounts payable (88) (84)    
Total current liabilities (88) (84)    
INTERCOMPANY PAYABLE (3,658) (3,721)    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes (2,896) (3,238)    
Total other long-term liabilities (2,896) (3,238)    
STOCKHOLDERS’ INVESTMENT (29,381) (28,463)    
LIABILITIES AND STOCKHOLDERS' INVESTMENT (36,023) (35,506)    
Parent Company Member        
CURRENT ASSETS        
Cash and cash equivalents 1,475 1,974 1,498 2,383
Receivables, less allowances 1 1    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 292 233    
Total current assets 1,768 2,208    
PROPERTY AND EQUIPMENT, AT COST 22 22    
Less accumulated depreciation and amortization 18 17    
Net property and equipment 4 5    
INTERCOMPANY RECEIVABLE 2,216 2,437    
INVESTMENT IN SUBSIDIARIES 26,637 24,766    
Other assets 3,043 3,359    
ASSETS 33,668 32,775    
CURRENT LIABILITIES        
Accrued salaries and employee benefits 52 54    
Accounts payable 124 8    
Accrued expenses 811 883    
Total current liabilities 987 945    
LONG-TERM DEBT, LESS CURRENT PORTION 14,443 13,451    
OTHER LONG-TERM LIABILITIES        
Other liabilities 3,054 4,595    
Total other long-term liabilities 3,054 4,595    
STOCKHOLDERS’ INVESTMENT 15,184 13,784    
LIABILITIES AND STOCKHOLDERS' INVESTMENT 33,668 32,775    
Guarantor Subsidiaries Member        
CURRENT ASSETS        
Cash and cash equivalents 301 326 331 487
Receivables, less allowances 4,636 4,461    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 819 724    
Total current assets 5,756 5,511    
PROPERTY AND EQUIPMENT, AT COST 46,448 43,760    
Less accumulated depreciation and amortization 22,810 21,566    
Net property and equipment 23,638 22,194    
INTERCOMPANY RECEIVABLE 1,442 1,284    
Goodwill 1,571 1,571    
INVESTMENT IN SUBSIDIARIES 2,744 3,697    
Other assets 1,031 967    
ASSETS 36,182 35,224    
CURRENT LIABILITIES        
Current portion of long-term debt 31 13    
Accrued salaries and employee benefits 1,184 1,377    
Accounts payable 1,354 1,501    
Accrued expenses 1,419 1,411    
Total current liabilities 3,988 4,302    
LONG-TERM DEBT, LESS CURRENT PORTION 244 245    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 4,978 4,436    
Other liabilities 3,345 3,375    
Total other long-term liabilities 8,323 7,811    
STOCKHOLDERS’ INVESTMENT 23,627 22,866    
LIABILITIES AND STOCKHOLDERS' INVESTMENT 36,182 35,224    
Non Guarantor Subsidiaries Member        
CURRENT ASSETS        
Cash and cash equivalents 1,442 1,277 $ 1,044 $ 971
Receivables, less allowances 2,824 2,831    
Spare parts, supplies, fuel, prepaid expenses and other, less allowances 236 246    
Total current assets 4,502 4,354    
PROPERTY AND EQUIPMENT, AT COST 3,282 3,236    
Less accumulated depreciation and amortization 1,311 1,151    
Net property and equipment 1,971 2,085    
Goodwill 5,429 5,176    
Other assets 1,052 1,851    
ASSETS 12,954 13,466    
CURRENT LIABILITIES        
Current portion of long-term debt 14 16    
Accrued salaries and employee benefits 454 541    
Accounts payable 1,317 1,519    
Accrued expenses 778 769    
Total current liabilities 2,563 2,845    
LONG-TERM DEBT, LESS CURRENT PORTION 26 37    
INTERCOMPANY PAYABLE 3,658 3,721    
OTHER LONG-TERM LIABILITIES        
Deferred income taxes 217 369    
Other liabilities 736 897    
Total other long-term liabilities 953 1,266    
STOCKHOLDERS’ INVESTMENT 5,754 5,597    
LIABILITIES AND STOCKHOLDERS' INVESTMENT $ 12,954 $ 13,466