Reorganization (Components Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Long-term debt	$ 2,482
Secured Variable And Fixed Rate Indebtedness Due Through 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	1,456
Effective interest rate percentage - minimum	1.00%
Effective interest rate percentage - maximum	13.00%
Debt instrument maturity year	2023
6.00% - 8.50% Special Facility Revenue Bonds Due Through 2036 [Member]
Debt Instrument [Line Items]
Long-term debt	186
Effective interest rate percentage - minimum	6.00%	6.00%
Effective interest rate percentage - maximum	8.50%	8.50%
Debt instrument maturity year	2036
6.25% Senior Convertible Notes Due 2014 [Member]
Debt Instrument [Line Items]
Long-term debt	460
Percentage of debt instrument, interest rate	6.25%	6.25%
Debt instrument maturity year	2014
9.00% - 10.20% Debentures Due Through 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	214
Percentage of debt instrument interest rate - minimum	9.00%	9.00%
Percentage of debt instrument interest rate - maximum	10.20%	10.20%
Debt instrument maturity year	2021
7.88% - 10.55% Notes Due Through 2039 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 166
Percentage of debt instrument interest rate - minimum	7.88%	7.88%
Percentage of debt instrument interest rate - maximum	10.55%	10.55%
Debt instrument maturity year	2039