EMPLOYEE BENEFIT PLANS - FUNDED STATUS (Details) - Qualified Defined Benefit [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Benefit obligation
Beginning of year	$ 1,898	$ 2,050
Service cost	37	41	$ 33
Interest cost	73	84	81
Plan settlement	0	(62)
Actuarial (gain) loss	104	(140)
Benefits paid	(69)	(75)
End of year	2,043	1,898	2,050
Plan assets at fair value
Beginning of year	1,737	1,917
Actual return on plan assets	178	(43)
Employer contributions	0	0
Plan settlement	0	(62)
Benefits paid	(69)	(75)
End of year	1,846	1,737	$ 1,917
Funded status (unfunded)	$ (197)	$ (161)
Percent funded	90.00%	92.00%
Accumulated benefit obligation	$ 1,900	$ 1,800