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EMPLOYEE BENEFITS - Plan Amounts Recognized in OCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]      
Net periodic pension income $ (7) $ (8) $ (3)
Net actuarial (gain) loss 7 237 (174)
Amortization of net actuarial loss (15) (10) (14)
Divestiture 0 (35) 0
Total recognized in other comprehensive income (8) 192 (188)
Total recognized in net periodic pension cost and other comprehensive income $ (15) $ 184 $ (191)