Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Net Periodic Benefit Costs (Details)

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BENEFIT PLANS - Net Periodic Benefit Costs (Details) - Pension Benefits - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of net periodic benefit expense [Abstract]      
Service cost $ 3 $ 3 $ 5
Interest cost 29 30 30
Expected return on plan assets (49) (55) (45)
Amortization of loss 9 7 7
Settlements 7 11 (8)
Benefit costs $ (1) $ (4) $ (11)