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TAXES - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 27, 2020
Feb. 20, 2020
Dec. 31, 2017
Income Taxes (Textuals) [Abstract]              
CARES Act interest deductibility refund amount   $ 18          
Effective income tax rate (percent)   11.20% 19.10% 32.40%      
Valuation allowances   $ (49) $ 5 $ 21      
Effective income tax rate reconciliation, tax credit, investment, amount $ 10 14 5 5      
Operating loss carryforwards, subject to expiration   6,800          
Operating loss carryforwards, subject to expiration, net of tax   1,400          
Operating loss carryforwards, not subject to expiration   12,400          
Operating loss carryforwards, not subject to expiration, net of tax   540          
Pre-tax net operating loss carryforwards expected to utilized   3,800          
Operating loss carryforwards expected to utilized, net of tax   155          
Unrecognized tax benefits   139 164 158     $ 80
Decrease resulting from change in worthless stock deduction   21          
Decrease resulting from nondeductible interest   2          
Decrease for lapse in statute   2 $ 4 $ 2      
Unrecognized tax benefits that would impact future tax rates   121          
Unrecognized tax benefits, portion expected to be resolved in the next fiscal year   57          
Unrecognized tax benefits that would impact effective tax rate   55          
FES              
Income Taxes (Textuals) [Abstract]              
Valuation allowances   $ 52          
IT Access Agreement | Affiliates | FES              
Income Taxes (Textuals) [Abstract]              
Amount paid to settle claims         $ 125 $ 125