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, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]      
Net actuarial loss $ (261) $ (257) $ (264)
Prior service cost 10 11 14
Defined benefit pension plans $ (251) $ (246) $ (250)