BUSINESS SEGMENT AND GEOGRAPHIC REGION INFORMATION - Business Segment Information (Details) - USD ($) $ in Millions	12 Months Ended			21 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021
Business Segment Information
Net sales	$ 19,628	$ 17,858	$ 21,390
Intangible asset amortization expense	(431)
Interest expense - net	(144)	(149)	(199)
Pension and other postretirement benefits income (expense)	(53)	(210)	(157)
Restructuring charges	(78)	(214)	0	$ (292)
Income before income taxes	2,896	1,746	2,591
Income tax expense	750	331	378
Net income	2,146	1,415	2,213
Less net income for noncontrolling interests	(2)	(5)	(2)
Net income attributable to Eaton ordinary shareholders	2,144	1,410	2,211
Electrical Americas
Business Segment Information
Net sales	7,242	6,680	8,175
Electrical Global
Business Segment Information
Net sales	5,516	4,703	5,172
Hydraulics
Business Segment Information
Net sales	1,300	1,842	2,204
Aerospace
Business Segment Information
Net sales	2,648	2,223	2,480
Vehicle
Business Segment Information
Net sales	2,579	2,118	3,038
eMobility
Business Segment Information
Net sales	343	292	321
Operating segments
Business Segment Information
Net sales	19,628	17,858	21,390
Segment operating profit (loss)	3,706	2,937	3,711
Operating segments | Electrical Americas
Business Segment Information
Net sales	7,242	6,680	8,175
Segment operating profit (loss)	1,495	1,352	1,549
Restructuring charges	(14)	(18)
Operating segments | Electrical Global
Business Segment Information
Net sales	5,516	4,703	5,172
Segment operating profit (loss)	1,034	750	897
Restructuring charges	(18)	(55)
Operating segments | Hydraulics
Business Segment Information
Net sales	1,300	1,842	2,204
Segment operating profit (loss)	177	186	193
Operating segments | Aerospace
Business Segment Information
Net sales	2,648	2,223	2,480
Segment operating profit (loss)	580	414	595
Restructuring charges	(8)	(34)
Operating segments | Vehicle
Business Segment Information
Net sales	2,579	2,118	3,038
Segment operating profit (loss)	449	243	460
Restructuring charges	(21)	(102)
Operating segments | eMobility
Business Segment Information
Net sales	343	292	321
Segment operating profit (loss)	(29)	(8)	17
Restructuring charges	(1)	(1)
Corporate
Business Segment Information
Intangible asset amortization expense	(444)	(354)	(367)
Interest expense - net	(144)	(149)	(199)
Pension and other postretirement benefits income (expense)	65	(40)	(12)
Restructuring charges	(16)	(4)
Other expense - net	$ (209)	$ (434)	$ (542)