ACQUISITIONS AND DIVESTITURES - Narrative (Details) $ / shares in Units, $ in Millions, $ in Millions						3 Months Ended								9 Months Ended	12 Months Ended
	Mar. 12, 2025 USD ($)	Nov. 15, 2024 USD ($)	Oct. 11, 2023 USD ($)	Jul. 27, 2022 USD ($)	Jul. 27, 2022 AUD ($)	Sep. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) business	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($) business $ / shares	Sep. 30, 2023 USD ($) business $ / shares	Sep. 30, 2022 USD ($)	Mar. 31, 2023
Business Combination [Line Items]
Settlement of AspenTech share awards															$ 76	$ 0	$ 0
Sales						$ 4,855	$ 4,553	$ 4,432	$ 4,175	$ 4,619	$ 4,380	$ 4,376	$ 4,117		18,016	17,492	15,165
Earnings before income taxes															2,934	2,020	2,903
Acquisition/divestiture fees and related costs															214	96	69
Amortization of intangible assets															1,174	1,366	764
Mark-to-market gain																	24
Purchases of businesses, net of cash acquired															37	8,342	705
Goodwill						$ 18,193				$ 18,067				$ 14,480	18,193	18,067	14,480
Gain (loss) on disposition of business																(48)
Proceeds from subordinated interest																79	161
Gain from periodic distribution from retained subordinated interest in Vertiv (VRT), net of tax																$ 60	$ 122	$ 15
Gain from periodic distribution from retained subordinated interest in Vertiv (VRT), net of tax, per diluted share (in dollars per share) | $ / shares																$ 0.10	$ 0.21
Goodwill, expected tax deductible amount			$ 121
Gain on sale of business															0	$ 539	$ 13,393
RUSSIAN FEDERATION
Business Combination [Line Items]
Disposal group, not discontinued operation, gain (loss) on disposal, net of tax																	47
Gain loss on sale of business tax per share (in usd per share) | $ / shares																$ 0.08
Gain on sale of business																	47
Percent of consolidated sales																			2.00%
Final Control
Business Combination [Line Items]
Number of divestitures | business										2						2
Gain (loss) on disposition of business																$ 48
Disposal group, not discontinued operation, gain (loss) on disposal, net of tax																$ 50
Gain loss on sale of business tax per share (in usd per share) | $ / shares																$ 0.09
National Instruments
Business Combination [Line Items]
Mark-to-market gain																	56
AspenTech
Business Combination [Line Items]
Total consideration paid in cash at closing	$ 7,200
Business combination, accrued deal fees	76
Business combination, accrued deal fees, net of tax	65
Settlement of AspenTech share awards	76
Business combination, deal and transaction fees	127
Business combination, deal and transaction fees, net of tax	$ 113
National Instruments
Business Combination [Line Items]
Total consideration paid in cash at closing			8,467
Sales			1,700
Earnings before income taxes																	170
Acquisition including sales																$ 1,464	1,693
Net loss since acquisition date																(537)
Acquisition/divestiture fees and related costs														110	$ 255	205	84
Amortization of intangible assets																	424
Net earnings from continuing operations common stockholders																$ 1,982	1,508
Goodwill			$ 3,442
National Instruments | Backlog Amortization
Business Combination [Line Items]
Amortization of intangible assets																	136
National Instruments | Business Combination, Pro Forma Information, Nonrecurring Adjustment, Inventory, Fair Value Adjustment
Business Combination [Line Items]
Net earnings from continuing operations common stockholders																	213
National Instruments | Retention Bonus
Business Combination [Line Items]
Net earnings from continuing operations common stockholders																	55
National Instruments | National Instruments
Business Combination [Line Items]
Acquisition/divestiture fees and related costs														88
2023 Transactions
Business Combination [Line Items]
Acquisition/divestiture fees and related costs																	198
Open Grid Systems Limited
Business Combination [Line Items]
Purchases of businesses, net of cash acquired		$ 46
Goodwill		32
Identifiable intangible assets		$ 20
Intangible assets, weighted average useful life		5 years
Other Segment Transactions
Business Combination [Line Items]
Purchases of businesses, net of cash acquired																	715
Goodwill														424			424
Identifiable intangible assets														323			$ 323
Intangible assets, weighted average useful life																	9 years
Number of businesses acquired | business																2	2
Goodwill, expected tax deductible amount		$ 0												$ 0			$ 0
Micromine
Business Combination [Line Items]
Purchase price				$ 623	$ 900