EATON SHAREHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 14,973	$ 16,133	$ 16,142
Other comprehensive (loss) income before reclassifications	55
Amounts reclassified from Accumulated other comprehensive loss (income)	507
Other comprehensive income (loss) attributable to Eaton ordinary shareholders	562	95	(145)
Balance at end of period	16,451	14,973	16,133
Currency translation and related hedging instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(2,647)
Other comprehensive (loss) income before reclassifications	(339)
Amounts reclassified from Accumulated other comprehensive loss (income)	369
Other comprehensive income (loss) attributable to Eaton ordinary shareholders	30
Balance at end of period	(2,617)	(2,647)
Pensions and other postretirement benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(1,481)
Other comprehensive (loss) income before reclassifications	355
Amounts reclassified from Accumulated other comprehensive loss (income)	140
Other comprehensive income (loss) attributable to Eaton ordinary shareholders	495
Balance at end of period	(986)	(1,481)
Cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(67)
Other comprehensive (loss) income before reclassifications	39
Amounts reclassified from Accumulated other comprehensive loss (income)	(2)
Other comprehensive income (loss) attributable to Eaton ordinary shareholders	37
Balance at end of period	(30)	(67)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(4,195)	(4,290)	(4,145)
Balance at end of period	$ (3,633)	$ (4,195)	$ (4,290)