Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Fair Value of Plan Assets (Details)

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BENEFIT PLANS - Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Changes due to:    
Fair value of plan assets at beginning of measurement year $ 1,050  
Fair value of plan assets at end of measurement year 1,007 $ 1,050
Pension Benefits    
Changes due to:    
Fair value of plan assets at beginning of measurement year 1,050 931
Actual return on plan assets 15 164
Settlements (28) (16)
Benefits paid (30) (29)
Total changes (43) 119
Fair value of plan assets at end of measurement year $ 1,007 $ 1,050