XML 22 R43.htm IDEA: XBRL DOCUMENT v2.4.0.8
Fair Value Instruments - Carrying and Estimated Fair Value of Debt (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
5.25% Notes due 2014 | Unsecured Debt
  
Debt Instrument [Line Items]  
Carrying amount of debt $ 355
Stated interest rate 5.25%
5.75% Notes due 2016 | Unsecured Debt
  
Debt Instrument [Line Items]  
Carrying amount of debt 318
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 321
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 50
Stated interest rate 10.38%
French Credit Agreements due 2018 - 1.05% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Carrying amount of debt 46
Stated interest rate 1.05%
Fixed-rate 737 Aircraft Notes payable through 2018 - 7.02% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Carrying amount of debt 28
Stated interest rate 7.02%
Term Loan Agreement due 2019 - 6.315% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Carrying amount of debt 203
Stated interest rate 6.315%
Term Loan Agreement due 2019 - 6.84% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Carrying amount of debt 79
Stated interest rate 6.84%
Term Loan Agreement due 2020 - 5.223% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Carrying amount of debt 403
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 329
Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate
  
Debt Instrument [Line Items]  
Carrying amount of debt 363
Stated interest rate 6.24%
7.375% Debentures due 2027 | Unsecured Debt
  
Debt Instrument [Line Items]  
Carrying amount of debt 136
Stated interest rate 7.375%
Level 2 | 5.25% Notes due 2014 | Unsecured Debt
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 361
Level 2 | 5.75% Notes due 2016 | Unsecured Debt
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 349
Level 2 | 5.25% Convertible Senior Notes due 2016 | Convertible Debt
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 206
Level 2 | 5.125% Notes due 2017 | Unsecured Debt
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 347
Level 2 | Fixed-rate 717 Aircraft Notes payable through 2017 - 10.38% | Enhanced Equipment Trust Certificate
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 50
Level 2 | Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 420
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 - 1.05% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 46
Level 3 | Fixed-rate 737 Aircraft Notes payable through 2018 - 7.02% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value 29
Level 3 | Term Loan Agreement due 2019 - 6.315% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Loans Payable, Fair Value 206
Level 3 | Term Loan Agreement due 2019 - 6.84% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Loans Payable, Fair Value 84
Level 3 | Term Loan Agreement due 2020 - 5.223% | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Loans Payable, Fair Value 380
Level 3 | Floating-rate 737 Aircraft Notes payable through 2020 | Notes Payable to Banks
  
Debt Instrument [Line Items]  
Notes Payable, Fair Value $ 324