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
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 18	$ 38
Interest cost	110	118
Expected return on plan assets	(157)	(200)
Actuarial loss	51	82
Amortization of prior service cost	4	4
Net periodic pension expense	$ 26	$ 42