CONTRACT AND OTHER DEFERRED ASSETS & CONTRACT LIABILITIES AND DEFERRED INCOME - Remaining Performance Obligation (Details) $ in Millions	Sep. 30, 2025 USD ($)
Capitalized Contract Cost [Line Items]
Performance obligations expected to be satisfied	$ 135,269
Equipment
Capitalized Contract Cost [Line Items]
Performance obligations expected to be satisfied	$ 54,092
Equipment \| Performance obligation satisfaction, period one \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Capitalized Contract Cost [Line Items]
Performance obligation expected to be satisfied (as a percent)	41.00%
Performance obligations expected to be satisfied, expected timing	1 year
Equipment \| Performance obligation satisfaction, period two \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Capitalized Contract Cost [Line Items]
Performance obligation expected to be satisfied (as a percent)	71.00%
Performance obligations expected to be satisfied, expected timing	2 years
Equipment \| Performance obligation satisfaction, period three \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Capitalized Contract Cost [Line Items]
Performance obligation expected to be satisfied (as a percent)	97.00%
Performance obligations expected to be satisfied, expected timing	5 years
Services
Capitalized Contract Cost [Line Items]
Performance obligations expected to be satisfied	$ 81,177
Services \| Performance obligation satisfaction, period one \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Capitalized Contract Cost [Line Items]
Performance obligation expected to be satisfied (as a percent)	17.00%
Performance obligations expected to be satisfied, expected timing	1 year
Services \| Performance obligation satisfaction, period two \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Capitalized Contract Cost [Line Items]
Performance obligation expected to be satisfied (as a percent)	53.00%
Performance obligations expected to be satisfied, expected timing	5 years
Services \| Performance obligation satisfaction, period three \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Capitalized Contract Cost [Line Items]
Performance obligation expected to be satisfied (as a percent)	78.00%
Performance obligations expected to be satisfied, expected timing	10 years
Services \| Performance obligation satisfaction, period four \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Capitalized Contract Cost [Line Items]
Performance obligation expected to be satisfied (as a percent)	91.00%
Performance obligations expected to be satisfied, expected timing	15 years

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479483/340-40-50-3

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

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Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

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