Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Amounts Recognized in AOCI (Details)

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BENEFIT PLANS - Amounts Recognized in AOCI (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Retirement Benefits [Abstract]        
Net actuarial loss $ (264) $ (217) $ (244)  
Prior service cost 14 12 14  
Defined benefit pension plans $ (250) $ (205) $ (230) $ (226)