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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 26	$ 21	$ 78	$ 64
Interest cost	84	98	251	294
Expected return on plan assets	(177)	(167)	(543)	(501)
Actuarial loss	35	51	114	152
Amortization of prior service cost	5	5	16	15
Net periodic pension (income) expense	$ (27)	$ 8	$ (84)	$ 24