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Fair Value Instruments - Carrying and Estimated Fair Value of Debt (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
5.25% Notes due 2014 | Unsecured Debt
  
Debt Instrument [Line Items]  
Carrying amount of debt $ 350
Stated interest rate 5.25%
5.75% Notes due 2016 | Unsecured Debt
  
Debt Instrument [Line Items]  
Carrying amount of debt 314
Stated interest rate 5.75%
5.25% Convertible Senior Notes due 2016 | Convertible Debt
  
Debt Instrument [Line Items]  
Carrying amount of debt 114
Stated interest rate 5.25%
5.125% Notes due 2017 | Unsecured Debt
  
Debt Instrument [Line Items]  
Carrying amount of debt 317
Stated interest rate 5.125%
Fixed-rate 717 Aircraft Notes payable through 2017 - 10.38% | Enhanced Equipment Trust Certificate
  
Debt Instrument [Line Items]  
Carrying amount of debt 7
Stated interest rate 10.38%
French Credit Agreements due 2018 - 1.03% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Carrying amount of debt 41
Stated interest rate 1.03%
Fixed-rate 737 Aircraft Notes payable through 2018 - 7.02% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Carrying amount of debt 25
Stated interest rate 7.02%
Term Loan Agreement due 2019 - 6.315% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Carrying amount of debt 186
Stated interest rate 6.315%
Term Loan Agreement due 2019 - 6.84% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Carrying amount of debt 73
Stated interest rate 6.84%
Term Loan Agreement due 2020 - 5.223% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Carrying amount of debt 382
Stated interest rate 5.223%
Floating-rate 737 Aircraft Notes payable through 2020 | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Carrying amount of debt 309
Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate
  
Debt Instrument [Line Items]  
Carrying amount of debt 355
Stated interest rate 6.24%
7.375% Debentures due 2027 | Unsecured Debt
  
Debt Instrument [Line Items]  
Carrying amount of debt 135
Stated interest rate 7.375%
Level 2 | 5.25% Notes due 2014 | Unsecured Debt
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 350
Level 2 | 5.75% Notes due 2016 | Unsecured Debt
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 342
Level 2 | 5.25% Convertible Senior Notes due 2016 | Convertible Debt
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 267
Level 2 | 5.125% Notes due 2017 | Unsecured Debt
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 340
Level 2 | Fixed-rate 717 Aircraft Notes payable through 2017 - 10.38% | Enhanced Equipment Trust Certificate
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 8
Level 2 | Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 423
Level 2 | 7.375% Debentures due 2027 | Unsecured Debt
  
Debt Instrument [Line Items]  
Loans Payable, Fair Value 162
Level 3 | French Credit Agreements due 2018 - 1.03% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 41
Level 3 | Fixed-rate 737 Aircraft Notes payable through 2018 - 7.02% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 26
Level 3 | Term Loan Agreement due 2019 - 6.315% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Loans Payable, Fair Value 195
Level 3 | Term Loan Agreement due 2019 - 6.84% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Loans Payable, Fair Value 79
Level 3 | Term Loan Agreement due 2020 - 5.223% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Loans Payable, Fair Value 378
Level 3 | Floating-rate 737 Aircraft Notes payable through 2020 | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value $ 302