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Fair Value Instruments - Carrying and Estimated Fair Value of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt and Capital Lease Obligations | $ 3,396 | $ 3,693
French Credit Agreements due 2018 - 2.54% |  |
Debt Instrument [Line Items] |  |
Secured Debt - Carrying Value | 0 | $ 1
Interest rate stated in the debt agreement (in hundredths) |  | 2.54%
Fixed-rate 737 Aircraft Notes payable through 2018 - 7.03% |  |
Debt Instrument [Line Items] |  |
Interest rate stated in the debt agreement (in hundredths) |  | 7.03%
2.75% Unsecured Senior Notes Due November 2019 |  |
Debt Instrument [Line Items] |  |
Unsecured Debt - Carrying Value | $ 300 | $ 300
Interest rate stated in the debt agreement (in hundredths) | 2.75% |
2.75% Unsecured Senior Notes Due November 2019 | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Interest rate stated in the debt agreement (in hundredths) | 2.75% |
Term Loan Agreement payable through May 2019 - 6.315% |  |
Debt Instrument [Line Items] |  |
Secured Debt - Carrying Value | $ 23 | 66
Interest rate stated in the debt agreement (in hundredths) | 6.315% |
Term Loan Agreement payable through May 2019 - 6.315% | Notes Payable to Banks |  |
Debt Instrument [Line Items] |  |
Interest rate stated in the debt agreement (in hundredths) | 6.315% |
Term Loan Agreement payable through July 2019 - 4.84% |  |
Debt Instrument [Line Items] |  |
Secured Debt - Carrying Value | $ 10 | 19
Interest rate stated in the debt agreement (in hundredths) | 4.84% |
2.65% Notes due 2020 |  |
Debt Instrument [Line Items] |  |
Unsecured Debt - Carrying Value | $ 492 | 491
Interest rate stated in the debt agreement (in hundredths) | 2.65% |
2.65% Notes due 2020 | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Interest rate stated in the debt agreement (in hundredths) | 2.65% |
Term Loan Agreement payable through 2020 - 5.223% |  |
Debt Instrument [Line Items] |  |
Secured Debt - Carrying Value | $ 187 | 237
Interest rate stated in the debt agreement (in hundredths) | 5.223% |
Term Loan Agreement payable through 2020 - 5.223% | Notes Payable to Banks |  |
Debt Instrument [Line Items] |  |
Interest rate stated in the debt agreement (in hundredths) | 5.223% |
Unsecured Senior Notes Due 2022 - 2.75% |  |
Debt Instrument [Line Items] |  |
Unsecured Debt - Carrying Value | $ 300 | 300
Interest rate stated in the debt agreement (in hundredths) | 2.75% |
Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate |  |
Debt Instrument [Line Items] |  |
Secured Debt - Carrying Value | $ 250 | 294
Interest rate stated in the debt agreement (in hundredths) | 6.24% |
Term Loan Agreement Due 2026 - 3.88% |  |
Debt Instrument [Line Items] |  |
Secured Debt - Carrying Value | $ 197 | 215
Interest rate stated in the debt agreement (in hundredths) | 3.88% |
Unsecured Senior Notes Due 2026 - 3.00% |  |
Debt Instrument [Line Items] |  |
Unsecured Debt - Carrying Value | $ 300 | 300
Interest rate stated in the debt agreement (in hundredths) | 3.00% |
Unsecured Senior Notes Due 2027 - 3.45% |  |
Debt Instrument [Line Items] |  |
Unsecured Debt - Carrying Value | $ 300 | 300
Interest rate stated in the debt agreement (in hundredths) | 3.45% |
7.375% Debentures due 2027 |  |
Debt Instrument [Line Items] |  |
Unsecured Debt - Carrying Value | $ 125 | 127
Interest rate stated in the debt agreement (in hundredths) | 7.375% |
Level 2 | 2.75% Unsecured Senior Notes Due November 2019 | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Notes Payable, Fair Value | $ 299 |
Level 2 | 2.65% Notes due 2020 | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Notes Payable, Fair Value | 486 |
Level 2 | Unsecured Senior Notes Due 2022 - 2.75% | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Notes Payable, Fair Value | 293 |
Level 2 | Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate |  |
Debt Instrument [Line Items] |  |
Notes Payable, Fair Value | 263 |
Level 2 | Unsecured Senior Notes Due 2026 - 3.00% | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Notes Payable, Fair Value | 279 |
Level 2 | Unsecured Senior Notes Due 2027 - 3.45% | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Notes Payable, Fair Value | 286 |
Level 2 | 7.375% Debentures due 2027 | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Loans Payable, Fair Value | 146 |
Level 3 | Term Loan Agreement payable through May 2019 - 6.315% | Notes Payable to Banks |  |
Debt Instrument [Line Items] |  |
Loans Payable, Fair Value | 23 |
Level 3 | Term Loan Agreement payable through July 2019 - 4.84% | Notes Payable to Banks |  |
Debt Instrument [Line Items] |  |
Notes Payable, Fair Value | 10 |
Level 3 | Term Loan Agreement payable through 2020 - 5.223% | Notes Payable to Banks |  |
Debt Instrument [Line Items] |  |
Loans Payable, Fair Value | 187 |
Level 3 | 737 Aircraft Notes payable through 2020 | Notes Payable to Banks |  |
Debt Instrument [Line Items] |  |
Notes Payable, Fair Value | 67 |
Level 3 | Term Loan Agreement Due 2026 - 3.88% | Notes Payable to Banks |  |
Debt Instrument [Line Items] |  |
Loans Payable, Fair Value | 197 |
AirTran Airways | Fixed-rate 737 Aircraft Notes payable through 2018 - 7.03% |  |
Debt Instrument [Line Items] |  |
Secured Debt - Carrying Value | 0 | 3
AirTran Airways | 737 Aircraft Notes payable through 2020 |  |
Debt Instrument [Line Items] |  |
Secured Debt - Carrying Value | $ 67 | $ 155

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