Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Fair Value of Plan Assets (Details 1)

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BENEFIT PLANS - Fair Value of Plan Assets (Details 1) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Change in Fair Value of Plan Assets [Abstract]    
Fair value of plan assets at beginning of measurement year $ 828  
Fair value of plan assets at end of measurement year 931 $ 828
Pension Benefits    
Change in Fair Value of Plan Assets [Abstract]    
Fair value of plan assets at beginning of measurement year 828 903
Actual return on plan assets 145 (30)
Settlements (13) (19)
Defined Benefit Plan, Plan Assets, Benefits Paid 29 26
Total changes 103 (75)
Fair value of plan assets at end of measurement year $ 931 $ 828