EMPLOYEE RETIREMENT PLANS - Changes in the Projected Benefit Obligation and Fair Value of Plan Assets, and the Funded Status of Defined-benefit Pension Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Qualified
Changes in projected benefit obligation:
Balance at the beginning of the period	$ 1,145	$ 983
Service cost	3	3	$ 3
Interest cost	41	41
Actuarial (gain) loss, net	(61)	184
Foreign currency exchange	(23)	(24)
Benefit payments	(46)	(42)
Balance at the end of the period	1,059	1,145	983
Changes in fair value of plan assets:
Balance at the beginning of the period	691	659
Actual return on plan assets	(12)	38
Foreign currency exchange	(7)	(8)
Company contributions	38	49
Expenses, other	(6)	(5)
Benefit payments	(46)	(42)
Balance at the end of the period	658	691	659
Funded status at the end of the period	(401)	(454)
Non-Qualified
Changes in projected benefit obligation:
Balance at the beginning of the period	190	163
Interest cost	7	7
Actuarial (gain) loss, net	(11)	32
Benefit payments	(12)	(12)
Balance at the end of the period	174	190	$ 163
Changes in fair value of plan assets:
Company contributions	12	12
Benefit payments	(12)	(12)
Funded status at the end of the period	$ (174)	$ (190)