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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 41	$ 39	$ 79	$ 79
Interest cost	120	139	238	277
Expected return on plan assets	(200)	(193)	(400)	(385)
Actuarial loss	108	88	190	173
Amortization of prior service cost	4	7	8	14
Net periodic pension expense	$ 73	$ 80	$ 115	$ 158