RETIREMENT PLANS Net Periodic Pension Expense for Qualified and Nonqualified U.S. Defined Benefit Plans (Details) - U.S. plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 25	$ 23	$ 52	$ 43
Interest cost	84	98	167	196
Expected return on plan assets	(183)	(167)	(366)	(334)
Actuarial loss	40	46	79	101
Amortization of prior service cost	5	5	11	10
Net periodic pension (income) expense	$ (29)	$ 5	$ (57)	$ 16