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, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of measurement year $ 900 $ 851  
Service cost 3 3 $ 5
Interest cost 29 30 30
Benefits Paid 26 27  
Settlements (18) (31)  
Actuarial assumptions and gains and losses (67) 74  
Total changes (79) 49  
Projected benefit obligation at end of measurement year $ 821 $ 900 $ 851