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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Valuation allowance, increase (decrease) $ 156      
Valuation allowance for deferred tax assets        
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Year 4,576 $ 4,507 $ 4,575  
Other Additions (Deductions) 200 50 (345)  
Additons Charged to Other Accounts (16) 19 8  
SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease) (28) 0 269  
Balance at End of Year 4,732 4,576 4,507 $ 4,575
Reserve for Taxes, Other than Income Taxes [Member]        
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Year 58 62 58  
Other Additions (Deductions) 21 0 7  
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction (1) 0 (1)  
SEC Schedule, 12-09, Valuation Allowance and Reserves, Deduction, Other 4 (4) (2)  
Balance at End of Year 82 58 62 58
Net Operating Losses        
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Valuation allowance, increase (decrease) 250     $ (45)
Domestic Deferred Tax Assets [Member]        
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Valuation allowance, increase (decrease) $ (11) $ 208 (44)  
Foreign Operating Losses [Member]        
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Valuation allowance, increase (decrease)     $ 244