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EMPLOYEE RETIREMENT PLANS - Changes in the Projected Benefit Obligation and Fair Value of Plan Assets, and the Funded Status of Defined-benefit Pension Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Qualified      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at January 1 $ 1,034 $ 896  
Service cost 3 3 $ 3
Interest cost 23 33  
Actuarial loss, net (85) (149)  
Foreign currency exchange (18) 3  
Benefit payments 45 44  
Divestitures 0 0  
Projected benefit obligation at December 31 1,118 1,034 896
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at January 1 780 670  
Actual return on plan assets 67 105  
Foreign currency exchange (8) 1  
Company contributions 57 56  
Expenses, other 4 6  
Benefit payments 45 44  
Fair value of plan assets at December 31 863 780 670
Funded status at December 31 (255) (254)  
Non-Qualified      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at January 1 161 155  
Service cost 0 0 0
Interest cost 5 6  
Actuarial loss, net (10) (13)  
Foreign currency exchange 0 0  
Benefit payments 13 13  
Divestitures (1) 0  
Projected benefit obligation at December 31 162 161 155
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at January 1 0 0  
Actual return on plan assets 0 0  
Foreign currency exchange 0 0  
Company contributions 13 13  
Expenses, other 0 0  
Benefit payments 13 13  
Fair value of plan assets at December 31 0 0 $ 0
Funded status at December 31 $ (162) $ (161)