RETIREMENT BENEFITS PLANS - Changes in Pension and Other Postretirement Liabilities Recognized in AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Pension plans | United States
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss
Balance at January 1	$ 1,051	$ 1,103
Prior service cost arising during the year	1	0
Net loss (gain) arising during the year	(238)	112
Currency translation	0	0
Other	0	0
Less amounts included in expense during the year	(101)	(164)
Net change for the year	(338)	(52)
Balance at December 31	713	1,051
Pension plans | Foreign Plan
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss
Balance at January 1	1,026	904
Prior service cost arising during the year	0	1
Net loss (gain) arising during the year	(151)	141
Currency translation	(24)	48
Other	0	2
Less amounts included in expense during the year	(88)	(70)
Net change for the year	(263)	122
Balance at December 31	763	1,026
Other postretirement benefits plans
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss
Balance at January 1	(2)	(25)
Prior service cost arising during the year	0	0
Net loss (gain) arising during the year	(59)	10
Currency translation	0	0
Other	0	0
Less amounts included in expense during the year	6	13
Net change for the year	(53)	23
Balance at December 31	$ (55)	$ (2)