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Chapter 11 Proceedings and Ability to continue as a Going Concern - Reorganziation Items (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Reorganizations [Abstract]        
Unamortized Debt Issuance and Discount Expensed     $ 126  
Unamortized Interest Rate Derivative Loss Expensed     8  
Reorganization Items     134 $ 0
Backstop Commitment Fees     81  
DIP Financing Fees     56  
Professional Fees     32  
Reorganization Items (Fees)     169  
Total Reorganization Items $ 303 $ 0 303 $ 0
Reorganization Items (Fees) Unpaid     45  
Reorganization Items (Fees) Paid     $ 124