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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 16	$ 41	$ 34	$ 79
Interest cost	110	120	220	238
Expected return on plan assets	(158)	(200)	(315)	(400)
Actuarial loss	49	108	100	190
Amortization of prior service cost	4	4	8	8
Net periodic pension expense	$ 21	$ 73	$ 47	$ 115