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Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Condensed Financial Statements Captions [Line Items]        
REVENUES $ 16,526 $ 14,997 $ 48,136 $ 44,591
OPERATING EXPENSES:        
Salaries and employee benefits 5,981 5,395 17,241 16,059
Purchased transportation 3,935 3,498 11,220 10,169
Rentals and landing fees 873 834 2,526 2,426
Depreciation and amortization 786 762 2,293 2,241
Fuel 914 735 2,435 2,043
Maintenance and repairs 628 588 1,968 1,765
Other 2,408 2,160 7,073 6,432
OPERATING EXPENSES 15,525 13,972 44,756 41,135
OPERATING INCOME 1,001 1,025 3,380 3,456
OTHER INCOME (EXPENSE):        
Interest, net (125) (122) (363) (354)
Other, net (2) (4) (22) 17
INCOME BEFORE INCOME TAXES 874 899 2,995 3,119
PROVISION FOR INCOME TAXES (1,200) 337 (450) 1,142
NET INCOME 2,074 562 3,445 1,977
COMPREHENSIVE INCOME 2,151 653 3,503 1,812
Consolidation Eliminations [Member]        
Condensed Financial Statements Captions [Line Items]        
REVENUES (136) (72) (353) (212)
OPERATING EXPENSES:        
Purchased transportation (84) (27) (216) (81)
Rentals and landing fees (2) (1) (6) (4)
Other (50) (44) (131) (127)
OPERATING EXPENSES (136) (72) (353) (212)
OTHER INCOME (EXPENSE):        
Equity in earnings of subsidiaries (2,076) (521) (3,484) (2,046)
INCOME BEFORE INCOME TAXES (2,076) (521) (3,484) (2,046)
NET INCOME (2,076) (521) (3,484) (2,046)
COMPREHENSIVE INCOME (2,076) (521) (3,484) (2,046)
Parent Company [Member] | Reportable Legal Entities [Member]        
OPERATING EXPENSES:        
Salaries and employee benefits 39 29 112 94
Rentals and landing fees 2 1 4 4
Depreciation and amortization 1 1 1 1
Maintenance and repairs 1 1 1 1
Intercompany charges, net (114) (87) (325) (266)
Other 71 55 207 166
OTHER INCOME (EXPENSE):        
Equity in earnings of subsidiaries 2,074 562 3,445 1,977
Interest, net (137) (129) (396) (374)
Intercompany charges, net 140 130 403 376
Other, net (3) (1) (7) (2)
INCOME BEFORE INCOME TAXES 2,074 562 3,445 1,977
NET INCOME 2,074 562 3,445 1,977
COMPREHENSIVE INCOME 2,051 543 3,385 1,921
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Condensed Financial Statements Captions [Line Items]        
REVENUES 12,433 11,275 36,044 33,175
OPERATING EXPENSES:        
Salaries and employee benefits 4,623 4,210 13,289 12,477
Purchased transportation 2,459 2,219 6,836 6,210
Rentals and landing fees 684 657 1,951 1,902
Depreciation and amortization 670 649 1,958 1,894
Fuel 837 657 2,220 1,819
Maintenance and repairs 543 514 1,729 1,544
Intercompany charges, net 185 (33) 298 67
Other 1,596 1,428 4,664 4,230
OPERATING EXPENSES 11,597 10,301 32,945 30,143
OPERATING INCOME 836 974 3,099 3,032
OTHER INCOME (EXPENSE):        
Equity in earnings of subsidiaries 2 (41) 39 69
Interest, net 11 6 35 19
Intercompany charges, net (78) (79) (220) (224)
Other, net 104 (118) 88 (128)
INCOME BEFORE INCOME TAXES 875 742 3,041 2,768
PROVISION FOR INCOME TAXES (1,197) 280 (573) 951
NET INCOME 2,072 462 3,614 1,817
COMPREHENSIVE INCOME 2,069 444 3,605 1,781
Non Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Condensed Financial Statements Captions [Line Items]        
REVENUES 4,229 3,794 12,445 11,628
OPERATING EXPENSES:        
Salaries and employee benefits 1,319 1,156 3,840 3,488
Purchased transportation 1,560 1,306 4,600 4,040
Rentals and landing fees 189 177 577 524
Depreciation and amortization 115 112 334 346
Fuel 77 78 215 224
Maintenance and repairs 84 73 238 220
Intercompany charges, net (71) 120 27 199
Other 791 721 2,333 2,163
OPERATING EXPENSES 4,064 3,743 12,164 11,204
OPERATING INCOME 165 51 281 424
OTHER INCOME (EXPENSE):        
Interest, net 1 1 (2) 1
Intercompany charges, net (62) (51) (183) (152)
Other, net (103) 115 (103) 147
INCOME BEFORE INCOME TAXES 1 116 (7) 420
PROVISION FOR INCOME TAXES (3) 57 123 191
NET INCOME 4 59 (130) 229
COMPREHENSIVE INCOME $ 107 $ 187 $ (3) $ 156