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, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 38	$ 40
Interest cost	118	138
Expected return on plan assets	(200)	(192)
Actuarial loss	82	85
Amortization of prior service cost	4	7
Net periodic pension expense	$ 42	$ 78