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, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of net periodic benefit expense [Abstract]      
Service cost $ 2 $ 3 $ 3
Interest cost 32 29 30
Expected return on plan assets (44) (49) (55)
Amortization of loss 6 9 7
Settlements 5 7 11
Benefit costs $ 1 $ (1) $ (4)