Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Narrative (Details)

v3.20.4
BENEFIT PLANS - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Employer Contributions $ 0    
Average duration of plan assets investment in bonds, years 15 years 3 months 18 days    
Estimated life of benefit obligations 13 years 6 months    
Defined Contribution Plan, Cost $ 47 $ 51 $ 46
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Actual plan asset allocations 2.00%    
Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Actual plan asset allocations 17.00%    
Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Actual plan asset allocations 81.00%    
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligations in excess of plan assets, aggregate projected benefit obligation $ 24    
Defined Benefit Plan, Expected Amortization, Next Fiscal Year $ 6    
Minimum | Pension Benefits | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 20.00%    
Minimum | Pension Benefits | Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 50.00%    
Maximum | Pension Benefits | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 50.00%    
Maximum | Pension Benefits | Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 80.00%