Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Projected Benefit Obligation (Details)

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BENEFIT PLANS - Projected Benefit Obligation (Details) - Pension Benefits - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of measurement year $ 821 $ 900  
Service cost 2 3 $ 3
Interest cost 32 29 30
Benefits Paid 29 26  
Settlements (14) (18)  
Actuarial assumptions and gains and losses 111 (67)  
Total changes 102 (79)  
Projected benefit obligation at end of measurement year $ 923 $ 821 $ 900