RETIREMENT BENEFITS PLANS - Employer Contributions to Retirement Benefits Plans (Details) - Pension plans - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future contributions, defined benefit plans	$ 114
Employer contributions to pension plans	343	$ 122	$ 119
United States
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future contributions, defined benefit plans	17
Employer contributions to pension plans	237	18	17
Foreign Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future contributions, defined benefit plans	97
Employer contributions to pension plans	$ 106	$ 104	$ 102

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration