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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 16, 2020
Dec. 31, 2019
Dec. 31, 2018
Subsequent Event [Line Items]      
Outstanding aggregate principal   $ 17,516 $ 17,400
Share price (in dollars per share)   $ 1.00  
Number of consecutive business days bid price of common stock below minimum threshold   30 days  
Grace period for compliance with Nasdaq minimum bid price requirement   180 days  
Number of consecutive business days minimum bid price must exceed minimum threshold   10 days  
Unsecured Debt [Member]      
Subsequent Event [Line Items]      
Outstanding aggregate principal   $ 10,949 11,297
Unsecured Debt [Member] | Senior Note Due 9/15/2020 [Member]      
Subsequent Event [Line Items]      
Outstanding aggregate principal   $ 55 $ 55
Interest rate   8.875% 8.875%
Debt instrument, maturity date   Sep. 15, 2020 Sep. 15, 2020
Unsecured Debt [Member] | Senior Note Due 9/15/2022 [Member]      
Subsequent Event [Line Items]      
Outstanding aggregate principal   $ 2,188 $ 2,188
Interest rate   10.50% 10.50%
Debt instrument, maturity date   Sep. 15, 2022  
Unsecured Debt [Member] | Senior Note Due 9/15/2025 [Member]      
Subsequent Event [Line Items]      
Outstanding aggregate principal   $ 3,600 $ 3,600
Interest rate   11.00% 11.00%
Debt instrument, maturity date   Sep. 15, 2025  
Unsecured Debt [Member] | Senior Note Due 9/15/2021 [Member]      
Subsequent Event [Line Items]      
Outstanding aggregate principal   $ 220 $ 220
Interest rate   6.25% 6.25%
Debt instrument, maturity date   Sep. 15, 2021 Sep. 15, 2021
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Deferred scheduled interest payments $ 322    
Debt repayment grace period 60 days    
Subsequent Event [Member] | Minimum [Member]      
Subsequent Event [Line Items]      
Percentage of outstanding principal held by holders of the deferred payment senior notes 25.00%