PENSION AND OTHER POST-EMPLOYMENT BENEFITS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and OPEB prior service costs amortized out of AOCI				$ 1
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service costs	$ 35	$ 46	$ 69	92
Interest costs	107	68	216	136
Expected return on plan assets	(142)	(164)	(270)	(328)
Amortization of prior service costs (credits)	1	0	1	1
Special termination benefits	5	0	5	0
Pension and OPEB mark-to-market adjustment	(59)	0	(59)	0
Net periodic benefit credits	(53)	(50)	(38)	(99)
Net periodic benefit credits, net of amounts capitalized	(70)	(72)	(73)	(141)
OPEB
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service costs	0	1	1	2
Interest costs	6	2	11	5
Expected return on plan assets	(8)	(10)	(16)	(20)
Amortization of prior service costs (credits)	(2)	(2)	(4)	(5)
Special termination benefits	2	0	2	0
Pension and OPEB mark-to-market adjustment	0	0	0	0
Net periodic benefit credits	(2)	(9)	(6)	(18)
Net periodic benefit credits, net of amounts capitalized	$ (3)	$ (10)	$ (7)	$ (19)