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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 17	$ 40	$ 51	$ 119
Interest cost	110	118	330	356
Expected return on plan assets	(158)	(200)	(473)	(600)
Actuarial loss	50	95	150	285
Amortization of prior service cost	4	4	12	12
Net periodic pension expense	$ 23	$ 57	$ 70	$ 172