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Long-Term and Other Debt - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jul. 01, 2020
Debt Instrument          
Document Period End Date     Jun. 30, 2020    
Gain (Loss) on Extinguishment of Debt $ (12) $ (60) $ (2) $ (60)  
Proceeds from Issuance of Debt 543        
Face value $ 9,259   $ 9,259    
Senior Unsecured Notes, Maturing 2026 [Member] | Senior Notes          
Debt Instrument          
Debt interest rate 8.25%   8.25%    
Face value $ 1,100   $ 1,100    
Senior Unsecured Notes Maturing 2025 [Member] | Senior Notes          
Debt Instrument          
Principal debt amount         $ 550
Debt interest rate         8.625%