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Debt - Long-Term Debt (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Long-term Debt [Abstract]      
Principal Amount $ 9,095,000,000 $ 8,916,000,000  
Carrying Amount 9,095,000,000 9,458,000,000  
Debt issuance costs 0 (44,000,000)  
Current maturities of long-term debt, gross (1,929,000,000) (385,000,000)  
Current maturities of long-term debt, net (1,929,000,000) (385,000,000)  
Less amounts reclassified to liabilities subject to compromise (7,166,000,000) 0  
Long-term debt, net 0 8,531,000,000  
Long-term debt, net 0 9,073,000,000  
Credit facility | Chesapeake revolving credit facility      
Long-term Debt [Abstract]      
Principal Amount 1,929,000,000 1,590,000,000  
Revolving credit facility 1,929,000,000 1,590,000,000  
Credit facility | Debtor-in-Possession Credit Agreement      
Long-term Debt [Abstract]      
Principal Amount 0 0  
Revolving credit facility 0 0  
Term loan      
Long-term Debt [Abstract]      
Principal Amount 1,500,000,000 1,500,000,000  
Carrying Amount $ 1,500,000,000 1,470,000,000  
Debt issuance costs   (13,000,000)  
Senior notes | 11.5% senior secured second lien notes due 2025      
Long-term Debt [Abstract]      
Interest rate, stated percentage 11.50%    
Principal Amount $ 2,330,000,000 2,330,000,000  
Carrying Amount $ 2,330,000,000 3,248,000,000  
Senior notes | 6.625% senior notes due 2020      
Long-term Debt [Abstract]      
Interest rate, stated percentage 6.625%    
Principal Amount $ 176,000,000 208,000,000  
Carrying Amount $ 176,000,000 208,000,000  
Senior notes | 6.875% senior notes due 2020      
Long-term Debt [Abstract]      
Interest rate, stated percentage 6.875%    
Principal Amount $ 73,000,000 93,000,000  
Carrying Amount $ 73,000,000 93,000,000  
Senior notes | 6.125% senior notes due 2021      
Long-term Debt [Abstract]      
Interest rate, stated percentage 6.125%    
Principal Amount $ 167,000,000 167,000,000  
Carrying Amount $ 167,000,000 167,000,000  
Senior notes | 5.375% senior notes due 2021      
Long-term Debt [Abstract]      
Interest rate, stated percentage 5.375%    
Principal Amount $ 127,000,000 127,000,000  
Carrying Amount $ 127,000,000 127,000,000  
Senior notes | 4.875% senior notes due 2022      
Long-term Debt [Abstract]      
Interest rate, stated percentage 4.875%    
Principal Amount $ 272,000,000 338,000,000  
Carrying Amount $ 272,000,000 338,000,000  
Senior notes | 5.75% senior notes due 2023      
Long-term Debt [Abstract]      
Interest rate, stated percentage 5.75%    
Principal Amount $ 167,000,000 209,000,000  
Carrying Amount $ 167,000,000 209,000,000  
Senior notes | 7.00% senior notes due 2024      
Long-term Debt [Abstract]      
Interest rate, stated percentage 7.00%   7.00%
Principal Amount $ 624,000,000 624,000,000 $ 850,000,000
Carrying Amount $ 624,000,000 624,000,000  
Senior notes | 6.875% senior notes due 2025      
Long-term Debt [Abstract]      
Interest rate, stated percentage 6.875%    
Principal Amount $ 2,000,000 2,000,000  
Carrying Amount $ 2,000,000 2,000,000  
Senior notes | 8.00% senior notes due 2025      
Long-term Debt [Abstract]      
Interest rate, stated percentage 8.00%    
Principal Amount $ 246,000,000 246,000,000  
Carrying Amount $ 246,000,000 245,000,000  
Senior notes | 7.5% senior notes due 2026      
Long-term Debt [Abstract]      
Interest rate, stated percentage 7.50%   7.50%
Principal Amount $ 119,000,000 119,000,000 $ 400,000,000
Carrying Amount $ 119,000,000 119,000,000  
Senior notes | 8.00% senior notes due 2026      
Long-term Debt [Abstract]      
Interest rate, stated percentage 8.00%    
Principal Amount $ 46,000,000 46,000,000  
Revolving credit facility 919,000,000    
Carrying Amount $ 46,000,000 44,000,000  
Senior notes | 8.00% senior notes due 2027      
Long-term Debt [Abstract]      
Interest rate, stated percentage 8.00%    
Principal Amount $ 253,000,000 253,000,000  
Carrying Amount $ 253,000,000 253,000,000  
Convertible debt | 5.5% convertible senior notes due 2026      
Long-term Debt [Abstract]      
Interest rate, stated percentage 5.50%    
Principal Amount $ 1,064,000,000 1,064,000,000  
Carrying Amount $ 1,064,000,000 $ 765,000,000