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Chapter 11 Proceedings - Reorganization Items (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Reorganizations [Abstract]    
Advisory and professional fees after filing $ (52)  
Remeasurement of terminated lease to allowable claim (186)  
Gain on write-off of related party balances 8  
Total reorganization items $ (230) $ 0