EMPLOYEE BENEFIT PLANS - FUNDED STATUS (Details) - Qualified Defined Benefit [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Benefit obligation
Beginning of year	$ 2,050	$ 1,709
Service cost	41	33	$ 46
Interest cost	84	81	73
Plan settlement	(62)	0
Actuarial (gain) loss	(140)	298
Benefits paid	(75)	(71)
End of year	1,898	2,050	1,709
Plan assets at fair value
Beginning of year	1,917	1,769
Actual return on plan assets	(43)	219
Employer contributions	0	0
Plan settlement	(62)	0
Benefits paid	(75)	(71)
End of year	1,737	1,917	$ 1,769
Funded status (unfunded)	$ (161)	$ (133)
Percent funded	92.00%	94.00%
Accumulated benefit obligation	$ 1,753	$ 1,909