PENSION BENEFITS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
United States, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 26,000,000	$ 25,000,000	$ 79,000,000	$ 74,000,000
Interest cost	77,000,000	116,000,000	230,000,000	346,000,000
Expected return on plan assets	(305,000,000)	(284,000,000)	(915,000,000)	(851,000,000)
Amortization of prior service (credit)	(11,000,000)	(11,000,000)	(33,000,000)	(32,000,000)
Net periodic benefit (income)	(213,000,000)	(154,000,000)	(639,000,000)	(463,000,000)
Non-US, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	7,000,000	6,000,000	20,000,000	17,000,000
Interest cost	18,000,000	26,000,000	58,000,000	78,000,000
Expected return on plan assets	(87,000,000)	(84,000,000)	(263,000,000)	(249,000,000)
Amortization of prior service (credit)	0	0	0	0
Net periodic benefit (income)	$ (62,000,000)	$ (52,000,000)	$ (185,000,000)	$ (154,000,000)