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EMPLOYEE RETIREMENT PLANS - Changes in the Fair Value of the Qualified Defined-benefit Pension Plan Level 3 Assets (Details) - Qualified - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Changes in the fair value of plan level 3 assets    
Fair Value, January 1 $ 1 $ 19
Purchases 5 0
Sales 0 (18)
Fair Value, December 31 $ 6 $ 1