EQUITY - Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	$ 619	$ 538
Income tax expense (benefit)	86	79
Net Income Attributable to Eaton ordinary shareholders	532	$ 458
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income Attributable to Eaton ordinary shareholders	(29)
Pensions and other postretirement benefits | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	(32)
Income tax expense (benefit)	(2)
Net Income Attributable to Eaton ordinary shareholders	(30)
Gains and (losses) on cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	0
Net Income Attributable to Eaton ordinary shareholders	1
Gains and (losses) on cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income | Commodity contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	$ 1