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Chapter 11 Reorganization (Liabilites Subject to Compromise Long-Term Debt) (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Liabilities Subject to Compromise, Debt and Accrued Interest $ 335 $ 358
Secured Variable And Fixed Rate Indebtedness Due Through 2023 [Member]
    
Debt Instrument [Line Items]    
Liabilities Subject to Compromise, Debt and Accrued Interest 149 172
Effective interest rate percentage - minimum (percent) 1.00%  
Effective interest rate percentage - maximum (percent) 10.00%  
Debt instrument maturity year Dec. 31, 2023  
6.00% - 8.50% Special Facility Revenue Bonds Due Through 2031 [Member]
    
Debt Instrument [Line Items]    
Liabilities Subject to Compromise, Debt and Accrued Interest $ 186 $ 186
Percentage of debt instrument interest rate - minimum (percent) 6.00%  
Percentage of debt instrument interest rate - maximum (percent) 8.50%  
Debt instrument maturity year Dec. 31, 2036