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Long-Term Debt - Narrative (Details) - USD ($)
1 Months Ended
Jul. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Long-term Debt      
Debt issuance, face amount   $ 37,401,000,000 $ 37,401,000,000
Senior Notes | Subsequent Event      
Long-term Debt      
Proceeds from issuance $ 1,985,000,000    
Senior Notes | Senior Notes due 2025, 8.000% | Subsequent Event      
Long-term Debt      
Debt issuance, face amount $ 500,000,000    
Interest rate 8.00%    
Senior Notes | senior Notes due 2027, 8.500% | Subsequent Event      
Long-term Debt      
Debt issuance, face amount $ 500,000,000    
Interest rate 8.50%    
Senior Notes | Senior Notes due 2030, 8.875% | Subsequent Event      
Long-term Debt      
Debt issuance, face amount $ 1,000,000,000.0    
Interest rate 8.875%    
Total Fair Value      
Long-term Debt      
Estimated fair value of debt   31,400,000,000 $ 38,800,000,000
Total Fair Value | Level 2      
Long-term Debt      
Estimated fair value of debt   $ 2,300,000,000