EATON SHAREHOLDERS' EQUITY - Net Income per Ordinary Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Net income attributable to Eaton ordinary shareholders	$ 2,144	$ 1,410	$ 2,211
Weighted-average number of ordinary shares outstanding - diluted (shares)	401.6	404.0	420.8
Less: dilutive effect of equity-based compensation (shares)	2.9	1.8	1.8
Weighted-average number of ordinary shares outstanding - basic (shares)	398.7	402.2	419.0
Net income per share attributable to Eaton ordinary shareholders - diluted (USD per share)	$ 5.34	$ 3.49	$ 5.25
Net income per share attributable to Eaton ordinary shareholders - basic (USD per share)	$ 5.38	$ 3.51	$ 5.28