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DESCRIPTION OF BUSINESS SEGMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Depreciable Lives and Net Book Value of Property and Equipment (Details) - USD ($) $ in Millions	May 31, 2025	May 31, 2024
Property Plant And Equipment [Line Items]
Net Book Value	$ 41,642	$ 41,491
Wide-body aircraft and related equipment
Property Plant And Equipment [Line Items]
Net Book Value	$ 18,202	17,936
Wide-body aircraft and related equipment | Minimum
Property Plant And Equipment [Line Items]
Depreciable lives range	18 years
Wide-body aircraft and related equipment | Maximum
Property Plant And Equipment [Line Items]
Depreciable lives range	30 years
Narrow-body and feeder aircraft and related equipment
Property Plant And Equipment [Line Items]
Net Book Value	$ 1,750	1,849
Narrow-body and feeder aircraft and related equipment | Minimum
Property Plant And Equipment [Line Items]
Depreciable lives range	5 years
Narrow-body and feeder aircraft and related equipment | Maximum
Property Plant And Equipment [Line Items]
Depreciable lives range	30 years
Package handling and ground support equipment
Property Plant And Equipment [Line Items]
Net Book Value	$ 7,573	7,607
Package handling and ground support equipment | Minimum
Property Plant And Equipment [Line Items]
Depreciable lives range	3 years
Package handling and ground support equipment | Maximum
Property Plant And Equipment [Line Items]
Depreciable lives range	15 years
Information technology
Property Plant And Equipment [Line Items]
Net Book Value	$ 1,568	1,722
Information technology | Minimum
Property Plant And Equipment [Line Items]
Depreciable lives range	3 years
Information technology | Maximum
Property Plant And Equipment [Line Items]
Depreciable lives range	7 years
Vehicles and trailers
Property Plant And Equipment [Line Items]
Net Book Value	$ 4,075	4,053
Vehicles and trailers | Minimum
Property Plant And Equipment [Line Items]
Depreciable lives range	3 years
Vehicles and trailers | Maximum
Property Plant And Equipment [Line Items]
Depreciable lives range	15 years
Facilities and other
Property Plant And Equipment [Line Items]
Net Book Value	$ 8,474	$ 8,324
Facilities and other | Minimum
Property Plant And Equipment [Line Items]
Depreciable lives range	1 year
Facilities and other | Maximum
Property Plant And Equipment [Line Items]
Depreciable lives range	33 years

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481372/852-10-55-10

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 360
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478451/942-360-50-1

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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