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Long-Term Debt (Long-Term Debt) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Long-term debt, beginning balance $ 17,516      
Principal Payments and Retirements (754)      
Long-term debt, ending balance 16,762      
Debt prior to reclassification to liabilities subject to compromise 16,762   $ 16,762 $ 17,516
Less: Debt Issuance Cost     (65) (168)
Less: Debt Discount     (47) (46)
Debt, less amortized debt issuance costs and discounts     16,650 17,302
Less: Current Portion     (5,701) (994)
Less: Debt subject to compromise     $ (10,949)  
Total Long term debt       16,308
Interest rate     8.67%  
Secured Debt [Member]        
Debt Instrument [Line Items]        
Long-term debt, beginning balance 5,711      
Principal Payments and Retirements   $ (2,130)    
Long-term debt, ending balance 4,957      
Debt prior to reclassification to liabilities subject to compromise 5,711   $ 4,957 5,711
Secured Debt [Member] | Parent Company [Member]        
Debt Instrument [Line Items]        
Long-term debt, beginning balance 5,711      
Principal Payments and Retirements (754)      
Long-term debt, ending balance 4,957      
Debt prior to reclassification to liabilities subject to compromise 4,957   $ 4,957 5,711
Interest rate     7.77%  
Secured Debt [Member] | Subsidiaries [Member]        
Debt Instrument [Line Items]        
Long-term debt, beginning balance 106      
Long-term debt, ending balance 106      
Debt prior to reclassification to liabilities subject to compromise 106   $ 106 106
Interest rate     8.37%  
Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Long-term debt, beginning balance 10,949      
Long-term debt, ending balance 10,949      
Debt prior to reclassification to liabilities subject to compromise 10,949   $ 10,949 10,949
Unsecured Debt [Member] | Parent Company [Member]        
Debt Instrument [Line Items]        
Long-term debt, beginning balance 10,949      
Long-term debt, ending balance 10,949      
Debt prior to reclassification to liabilities subject to compromise 10,949   $ 10,949 10,949
Interest rate     9.20%  
Unsecured Debt [Member] | Subsidiaries [Member]        
Debt Instrument [Line Items]        
Long-term debt, beginning balance 750      
Long-term debt, ending balance 750      
Debt prior to reclassification to liabilities subject to compromise $ 750   $ 750 $ 750
Interest rate     6.90%