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EMPLOYEE BENEFITS - Plan Amounts Recognized in AOCI (Details) - USD ($)
$ in Millions
Sep. 01, 2014
Dec. 31, 2015
Dec. 31, 2014
[1]
Compensation and Retirement Disclosure [Abstract]      
Net prior service credit   $ 0 $ 0
Net actuarial loss   599 606
Total loss recognized in accumulated other comprehensive income   $ 599 $ 606
AOCI loss transferred to Affiliate plans $ 35    
[1] December 31, 2014 amount excluded $35 million transferred to Affiliates on September 1, 2014.