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Long-Term Debt (8.0% Senior Notes, Due 2019) (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 22, 2011
Jul. 18, 2012
Mar. 21, 2012
Dec. 31, 2019
Jun. 22, 2018
Debt Instrument [Line Items]          
Long-term debt outstanding       $ 13,405,000,000  
Senior Notes at 8.875%, Due 2015 [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Extinguishment of debt amount $ 1,000,000,000 $ 934,000,000 $ 850,000,000    
Senior Notes at 8.0%, Due 2019 [Member]          
Debt Instrument [Line Items]          
Long-term debt outstanding         $ 155,000,000
Senior Notes at 8.0%, Due 2019 [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, offering date       Nov. 22, 2011  
Debt instrument aggregate principal amount $ 1,000,000,000        
Debt instrument, maturity date       Nov. 15, 2019  
Debt instrument stated interest rate 8.00%   8.00%    
Senior Notes at 8.0, Due 2019, March 21, 2012 Secondary Offering [Member]          
Debt Instrument [Line Items]          
Debt instrument stated interest rate     8.00%    
Senior Notes at 8.0, Due 2019, March 21, 2012 Secondary Offering [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, offering date       Mar. 21, 2012  
Debt instrument aggregate principal amount     $ 1,000,000,000    
Debt instrument prepium percentage     102.50%    
Junior-Priority Secured Notes At 9.875% Due 2023 [Member]          
Debt Instrument [Line Items]          
Debt instrument aggregate principal amount         1,770,000,000
Junior-Priority Secured Notes At 9.875% Due 2023 [Member] | Junior-Priority Secured Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, offering date       Jun. 22, 2018  
Debt instrument aggregate principal amount         $ 1,770,000,000
Debt instrument stated interest rate         11.00%