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Schedule of Long-term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Capital Lease Obligations | $ 885 | $ 681
Total | 3,693 | 3,410
Less current maturities | 348 | 566
Less debt discount and issuance costs | 25 | 23
Long-term debt less current maturities | 3,320 | 2,821
5.125% Notes due 2017 |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | $ 0 | 301
Interest rate stated in the debt agreement (in hundredths) | 5.125% |
Debt Instrument, Maturity Date Range, Start | Feb. 14, 2005 |
Debt Instrument, Maturity Date Range, End | Mar. 01, 2017 |
French Credit Agreements due 2018 - 2.54% |  |
Debt Instrument [Line Items] |  |
Secured Debt | $ 1 | 14
Interest rate stated in the debt agreement (in hundredths) | 2.54% |
Debt Instrument, Maturity Date Range, Start | Nov. 02, 2004 |
Debt Instrument, Maturity Date Range, End | Jun. 30, 2018 |
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% |
Debt Instrument, Maturity Date Range, Start | Jan. 11, 2006 |
Debt Instrument, Maturity Date Range, End | Jan. 11, 2018 |
Fixed-rate 737 Aircraft Notes payable through 2018 - 7.03% | AirTran Airways |  |
Debt Instrument [Line Items] |  |
Secured Debt | $ 3 | 8
2.75% Unsecured Senior Notes Due 2019 |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | $ 300 | 301
Interest rate stated in the debt agreement (in hundredths) | 2.75% |
Debt Instrument, Maturity Date Range, Start | Nov. 06, 2014 |
Debt Instrument, Maturity Date Range, End | Nov. 06, 2019 |
2.75% Unsecured Senior Notes Due 2019 | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Interest rate stated in the debt agreement (in hundredths) | 2.75% |
Term Loan Agreement payable through 2019 - 6.315% |  |
Debt Instrument [Line Items] |  |
Secured Debt | $ 66 | 106
Interest rate stated in the debt agreement (in hundredths) | 6.315% |
Debt Instrument, Maturity Date Range, Start | Apr. 29, 2009 |
Debt Instrument, Maturity Date Range, End | May 06, 2019 |
Term Loan Agreement payable through 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 2019 - 4.84% |  |
Debt Instrument [Line Items] |  |
Secured Debt | $ 19 | 28
Interest rate stated in the debt agreement (in hundredths) | 4.84% |
Debt Instrument, Maturity Date Range, Start | Jul. 01, 2009 |
Debt Instrument, Maturity Date Range, End | Jul. 01, 2019 |
2.65% Notes due 2020 |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | $ 491 | 492
Interest rate stated in the debt agreement (in hundredths) | 2.65% |
Debt Instrument, Maturity Date Range, Start | Nov. 05, 2015 |
Debt Instrument, Maturity Date Range, End | Nov. 05, 2020 |
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 | $ 237 | 284
Interest rate stated in the debt agreement (in hundredths) | 5.223% |
Debt Instrument, Maturity Date Range, Start | May 09, 2008 |
Debt Instrument, Maturity Date Range, End | May 09, 2020 |
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% |
737 Aircraft Notes payable through 2020 | AirTran Airways |  |
Debt Instrument [Line Items] |  |
Secured Debt | $ 155 | 206
Debt Instrument, Maturity Date Range, Start | May 08, 2006 |
Debt Instrument, Maturity Date Range, End | Apr. 03, 2020 |
Term Loan Agreement Due 2021 - 7.94% |  |
Debt Instrument [Line Items] |  |
Secured Debt | $ 0 | 20
Interest rate stated in the debt agreement (in hundredths) | 7.94% |
Debt Instrument, Maturity Date Range, Start | Oct. 31, 2016 |
Debt Instrument, Maturity Date Range, End | Aug. 01, 2017 |
Unsecured Senior Notes Due 2022 - 2.75% |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | $ 300 | 0
Interest rate stated in the debt agreement (in hundredths) | 2.75% |
Debt Instrument, Maturity Date Range, Start | Nov. 16, 2017 |
Debt Instrument, Maturity Date Range, End | Nov. 16, 2022 |
Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate |  |
Debt Instrument [Line Items] |  |
Secured Debt | $ 294 | 324
Interest rate stated in the debt agreement (in hundredths) | 6.24% |
Debt Instrument, Maturity Date Range, Start | Oct. 03, 2017 |
Debt Instrument, Maturity Date Range, End | Aug. 01, 2022 |
Term Loan Agreement Due 2026 - 2.67% |  |
Debt Instrument [Line Items] |  |
Secured Debt | $ 215 | 215
Interest rate stated in the debt agreement (in hundredths) | 2.67% |
Debt Instrument, Maturity Date Range, Start | Oct. 31, 2016 |
Debt Instrument, Maturity Date Range, End | Oct. 31, 2026 |
Unsecured Senior Notes Due 2026 - 3.00% |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | $ 300 | 300
Interest rate stated in the debt agreement (in hundredths) | 3.00% |
Debt Instrument, Maturity Date Range, Start | Nov. 04, 2016 |
Debt Instrument, Maturity Date Range, End | Nov. 15, 2026 |
Unsecured Senior Notes Due 2027 - 3.45% |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | $ 300 | 0
Interest rate stated in the debt agreement (in hundredths) | 3.45% |
Debt Instrument, Maturity Date Range, Start | Nov. 16, 2017 |
Debt Instrument, Maturity Date Range, End | Nov. 16, 2027 |
7.375% Debentures due 2027 |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | $ 127 | $ 130
Interest rate stated in the debt agreement (in hundredths) | 7.375% |
Debt Instrument, Maturity Date Range, Start | Feb. 28, 1997 |
Debt Instrument, Maturity Date Range, End | Mar. 01, 2027 |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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