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Chapter 11 Reorganization (Liabilites Subject to Compromise Long-Term Debt) (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Liabilities Subject to Compromise, Debt and Accrued Interest $ 1,130 $ 1,198
Secured Variable And Fixed Rate Indebtedness Due Through 2023 [Member]
    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum 1.00%  
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum 10.00%  
Debt Instrument, Maturity Date Range, End Dec. 31, 2023  
6.00% - 8.50% Special Facility Revenue Bonds Due Through 2031 [Member]
    
Debt Instrument [Line Items]    
Percentage of debt instrument interest rate - minimum (percent) 6.00%  
Percentage of debt instrument interest rate - maximum (percent) 8.50%  
Debt Instrument, Maturity Date Range, End Dec. 31, 2036  
Six Point Two Five Percent Senior Convertible Notes [Member]
    
Debt Instrument [Line Items]    
Debt instrument interest rate (percent) 6.25%  
Debt Instrument, Maturity Date Range, End Dec. 31, 2014  
9.00% - 10.20% Debentures Due Through 2021 [Member]
    
Debt Instrument [Line Items]    
Percentage of debt instrument interest rate - minimum (percent) 9.00%  
Percentage of debt instrument interest rate - maximum (percent) 10.20%  
Debt Instrument, Maturity Date Range, End Dec. 31, 2021  
7.88% - 10.55% Notes Due Through 2039 [Member]
    
Debt Instrument [Line Items]    
Percentage of debt instrument interest rate - minimum (percent) 7.88%  
Percentage of debt instrument interest rate - maximum (percent) 10.55%  
Debt Instrument, Maturity Date Range, End Dec. 31, 2039  
Classified As Subject to Compromise [Member] | Secured Variable And Fixed Rate Indebtedness Due Through 2023 [Member]
    
Debt Instrument [Line Items]    
Liabilities Subject to Compromise, Debt and Accrued Interest 104 172
Classified As Subject to Compromise [Member] | 6.00% - 8.50% Special Facility Revenue Bonds Due Through 2031 [Member]
    
Debt Instrument [Line Items]    
Percentage of debt instrument interest rate - minimum (percent) 6.00%  
Percentage of debt instrument interest rate - maximum (percent) 8.50%  
Liabilities Subject to Compromise, Debt and Accrued Interest 186 186
Classified As Subject to Compromise [Member] | 6.25% Senior Convertible Notes Due 2014 [Member]
    
Debt Instrument [Line Items]    
Liabilities Subject to Compromise, Debt and Accrued Interest 460 460
Classified As Subject to Compromise [Member] | 9.00% - 10.20% Debentures Due Through 2021 [Member]
    
Debt Instrument [Line Items]    
Liabilities Subject to Compromise, Debt and Accrued Interest 214 214
Classified As Subject to Compromise [Member] | 7.88% - 10.55% Notes Due Through 2039 [Member]
    
Debt Instrument [Line Items]    
Liabilities Subject to Compromise, Debt and Accrued Interest $ 166 $ 166