EQUITY - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 16,451	$ 14,973
Other comprehensive income (loss) before reclassifications	87
Amounts reclassified from Accumulated other comprehensive loss (income)	29
Other comprehensive income (loss) attributable to Eaton ordinary shareholders	116	(30)
Balance at end of period	16,656	$ 15,037
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(3,633)
Balance at end of period	(3,517)
Currency translation and related hedging instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(2,617)
Other comprehensive income (loss) before reclassifications	(62)
Amounts reclassified from Accumulated other comprehensive loss (income)	0
Other comprehensive income (loss) attributable to Eaton ordinary shareholders	(62)
Balance at end of period	(2,679)
Pensions and other postretirement benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(986)
Other comprehensive income (loss) before reclassifications	47
Amounts reclassified from Accumulated other comprehensive loss (income)	30
Other comprehensive income (loss) attributable to Eaton ordinary shareholders	77
Balance at end of period	(909)
Cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(30)
Other comprehensive income (loss) before reclassifications	102
Amounts reclassified from Accumulated other comprehensive loss (income)	(1)
Other comprehensive income (loss) attributable to Eaton ordinary shareholders	101
Balance at end of period	$ 71