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EMPLOYEE RETIREMENT PLANS - Net Periodic Pension Cost for Defined-benefit Pension Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net periodic pension cost for the company's defined-benefit pension plans        
Pre-tax net loss from accumulated other comprehensive income (loss) into net periodic pension cost   $ 7    
Qualified        
Net periodic pension cost for the company's defined-benefit pension plans        
Service cost   4 $ 3 $ 3
Interest cost   15 28 39
Expected return on plan assets   (9) (24) (44)
Settlement loss $ 406 404 0 0
Recognized prior service cost   1 1 0
Recognized net loss   14 22 18
Net periodic pension cost   429 30 16
Non-Qualified        
Net periodic pension cost for the company's defined-benefit pension plans        
Service cost   0 0 0
Interest cost   4 5 6
Expected return on plan assets   0 0 0
Settlement loss   0 0 0
Recognized prior service cost   0 0 0
Recognized net loss   2 3 2
Net periodic pension cost   $ 6 $ 8 $ 8