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, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of measurement year $ 1,026 $ 923  
Service cost 3 3 $ 2
Interest cost 19 26 32
Benefits paid (30) (29)  
Settlements (25) (19)  
Actuarial assumptions and gains (losses) (37) 122  
Total changes (70) 103  
Projected benefit obligation at end of measurement year $ 956 $ 1,026 $ 923