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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 40	$ 39	$ 119	$ 118
Interest cost	118	138	356	415
Expected return on plan assets	(200)	(192)	(600)	(577)
Actuarial loss	95	87	285	260
Amortization of prior service cost	4	7	12	21
Net periodic pension expense	$ 57	$ 79	$ 172	$ 237