Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Fair Value of Plan Assets (Details)

v3.20.4
BENEFIT PLANS - Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Change in Fair Value of Plan Assets [Abstract]    
Fair value of plan assets at beginning of measurement year $ 931  
Fair value of plan assets at end of measurement year 1,050 $ 931
Pension Benefits    
Change in Fair Value of Plan Assets [Abstract]    
Fair value of plan assets at beginning of measurement year 931 828
Actual return on plan assets 164 145
Settlements (16) (13)
Benefits paid (29) (29)
Total changes 119 103
Fair value of plan assets at end of measurement year $ 1,050 $ 931