RETIREMENT BENEFITS PLANS - Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Employer contributions to defined contribution plans	$ 171	$ 111	$ 130

Defined Contribution Plans, Employer Contributions - Amounts charged to expense

No definition available.

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Namespace Prefix:	etn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration