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, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Net actuarial loss $ (257) $ (264) $ (217)
Prior service cost 11 14 12
Defined benefit pension plans $ (246) $ (250) $ (205)