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EMPLOYEE RETIREMENT PLANS - Net Periodic Pension Cost for Defined-benefit Pension Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ 464    
Qualified      
Net periodic pension cost for the company's defined-benefit pension plans      
Service cost 3 $ 3 $ 3
Interest cost 28 39 36
Expected return on plan assets (24) (44) (48)
Recognized prior service cost 1 0 0
Recognized net loss 22 18 17
Net periodic pension cost 30 16 8
Non-Qualified      
Net periodic pension cost for the company's defined-benefit pension plans      
Service cost 0 0 0
Interest cost 5 6 6
Expected return on plan assets 0 0 0
Recognized prior service cost 0 0 0
Recognized net loss 3 2 3
Net periodic pension cost $ 8 $ 8 $ 9