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Long-term Debt, Short-term Borrowings, and Capital Lease Obligations (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) aircraft | Dec. 31, 2018 USD ($) aircraft | Dec. 31, 2017 USD ($) | Nov. 12, 2019 USD ($) aircraft | Mar. 30, 2014 USD ($) aircraft | Apr. 30, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Pledged Assets Not Separately Reported Flight Equipment | $ 4,300,000,000 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 341,000,000 |  |  |  |  |
Long-term Debt, by Type Alternative [Abstract] |  |  |  |  |  |
Long-term Debt | 2,245,000,000 | $ 1,563,000,000 |  |  |  |
Long-term Debt, Fair Value | $ 2,367,000,000 | $ 1,577,000,000 |  |  |  |
Long-term debt and capital lease obligations and the weighted average interest rate |  |  |  |  |  |
Finance Lease, Weighted Average Discount Rate, Percent | 4.75% | 4.73% |  |  |  |
Total debt and capital lease obligations | $ 2,352,000,000 | $ 1,680,000,000 |  |  |  |
Less: current maturities | (344,000,000) | (309,000,000) |  |  |  |
Debt Acquisition Cost | (18,000,000) | (10,000,000) |  |  |  |
Long-term debt and capital lease obligations | 1,990,000,000 | 1,361,000,000 |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 340,000,000 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 319,000,000 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 298,000,000 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 169,000,000 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 867,000,000 |  |  |  |  |
Finance Lease, Right-of-Use Asset | 171,000,000 | 181,000,000 |  |  |  |
Finance Lease Right Of Use Asset Accumulated Amortization | 80,000,000 | 72,000,000 |  |  |  |
Finance Lease, Liability, Payments, Due Next Twelve Months | 35,000,000 |  |  |  |  |
Finance Lease, Liability, Payments, Due Year Two | 39,000,000 |  |  |  |  |
Finance Lease, Liability, Payments, Due Year Three | 9,000,000 |  |  |  |  |
Finance Lease, Liability, Payments, Due Year Four | 9,000,000 |  |  |  |  |
Finance Lease, Liability, Payments, Due Year Five | 5,000,000 |  |  |  |  |
Finance Lease, Liability, Undiscounted Excess Amount | 8,000,000 |  |  |  |  |
Finance Lease, Liability | 89,000,000 | 107,000,000 |  |  |  |
Finance Lease, Liability, Current | 31,000,000 | 18,000,000 |  |  |  |
Finance Lease, Liability, Noncurrent | 58,000,000 | 89,000,000 |  |  |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities | 62,000,000 | 59,000,000 | $ 60,000,000 |  |  |
Finance Lease, Liability, Payments, Due after Year Five | $ 0 |  |  |  |  |
Floating rate equipment notes due through 2028 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 120,000,000 |  |  |  |
Long-term debt and capital lease obligations and the weighted average interest rate |  |  |  |  |  |
Weighted average interest rate | 4.30% | 4.90% |  |  |  |
Secured Debt | $ 201,000,000 | $ 247,000,000 |  |  |  |
Fixed rate enhanced equipment notes, due through 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 772,000,000 | $ 226,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.75% |  |
Long-term debt and capital lease obligations and the weighted average interest rate |  |  |  |  |  |
Weighted average interest rate | 4.50% | 4.50% |  |  |  |
Secured Debt | $ 134,000,000 | $ 152,000,000 |  |  |  |
Fixed rate enhanced equipment notes, due through 2032 [Member] |  |  |  |  |  |
Long-term Debt, by Type Alternative [Abstract] |  |  |  |  |  |
Long-term Debt | 581,000,000 | 0 |  |  |  |
Long-term Debt, Fair Value | $ 586,000,000 | $ 0 |  |  |  |
Long-term debt and capital lease obligations and the weighted average interest rate |  |  |  |  |  |
Weighted average interest rate | 2.80% | 0.00% |  |  |  |
Secured Debt |  | $ 0 |  | $ 589,000,000 |  |
Fixed rate enhanced equipment notes, due through 2028 [Member] |  |  |  |  |  |
Long-term Debt, by Type Alternative [Abstract] |  |  |  |  |  |
Long-term Debt | $ 181,000,000 | 0 |  |  |  |
Long-term Debt, Fair Value | $ 186,000,000 | $ 0 |  |  |  |
Long-term debt and capital lease obligations and the weighted average interest rate |  |  |  |  |  |
Weighted average interest rate | 3.00% | 0.00% |  |  |  |
Secured Debt |  | $ 0 |  | $ 183,000,000 |  |
Fixed rate equipment notes due through 2028 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount | $ 219,000,000 | $ 567,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.95% |  |
Long-term debt and capital lease obligations and the weighted average interest rate |  |  |  |  |  |
Weighted average interest rate | 4.20% | 4.70% |  |  |  |
Secured Debt | $ 1,113,000,000 | $ 1,131,000,000 |  |  |  |
Fixed rate specialty bonds, due through 2036 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 42,000,000
Long-term Debt, by Type Alternative [Abstract] |  |  |  |  |  |
Long-term Debt | 42,000,000 | 42,000,000 |  |  |  |
Long-term Debt, Fair Value | $ 46,000,000 | $ 44,000,000 |  |  |  |
Long-term debt and capital lease obligations and the weighted average interest rate |  |  |  |  |  |
Weighted average interest rate | 4.90% | 4.90% |  |  |  |
Secured Debt | $ 43,000,000 | $ 43,000,000 |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Debt Instrument, Net Amount |  |  |  |  |  | 43,000,000
Debt Instrument, Unamortized Premium |  |  |  |  |  | $ 1,000,000
Capital Lease Obligations [Member] |  |  |  |  |  |
Long-term debt and capital lease obligations and the weighted average interest rate |  |  |  |  |  |
Finance Lease, Weighted Average Discount Rate, Percent | 4.80% | 4.70% |  |  |  |
Non Public Debt Floating Rate Equipment Notes Due Through Two Thousand And Twenty Eight [Member] |  |  |  |  |  |
Long-term Debt, by Type Alternative [Abstract] |  |  |  |  |  |
Long-term Debt | $ 201,000,000 | $ 245,000,000 |  |  |  |
Long-term Debt, Fair Value | 207,000,000 | 245,000,000 |  |  |  |
Non Public Debt Fixed Rate Equipment Notes Due Through Two Thousand Twenty Eight [Member] |  |  |  |  |  |
Long-term Debt, by Type Alternative [Abstract] |  |  |  |  |  |
Long-term Debt | 1,107,000,000 | 1,125,000,000 |  |  |  |
Long-term Debt, Fair Value | 1,201,000,000 | 1,135,000,000 |  |  |  |
Non Public Debt Fixed Rate Enhanced Equipment Notes Due Through Two Thousand And Twenty Three [Member] |  |  |  |  |  |
Long-term Debt, by Type Alternative [Abstract] |  |  |  |  |  |
Long-term Debt | 133,000,000 | 151,000,000 |  |  |  |
Long-term Debt, Fair Value | $ 141,000,000 | 153,000,000 |  |  |  |
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Floating rate equipment notes due through 2028 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR, plus a margin |  |  |  |  |
Fixed rate enhanced equipment notes, due through 2023 [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Debt Instrument, Frequency of Periodic Payment | semi-annually |  |  |  |  |
Morgan Stanley [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 200,000,000 |  |  |  |  |
Morgan Stanley [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR, plus a margin |  |  |  |  |
Revolving Credit Facility and Letter of Credit Facility [Member] | Morgan Stanley [Member] | Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Line of Credit | $ 0 | 0 |  |  |  |
Revolving Credit Facility and Letter of Credit Facility [Member] | Citibank [Member] | Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Line of Credit | 0 | $ 0 |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 550,000,000 |  |  |  |  |
Revolving Credit Facility and Letter of Credit Facility [Member] | Citibank [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR, plus a margin |  |  |  |  |
A-320-200 [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Finance Lease, Number of Aircraft Leases | aircraft | 4 | 4 |  |  |  |
A-320-200 [Member] | Secured Debt [Member] | Fixed rate enhanced equipment notes, due through 2023 [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Number of New Aircraft Held As Security | aircraft |  |  |  |  | 14 |
A-321-200 [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Finance Lease, Number of Aircraft Leases | aircraft | 2 | 2 |  |  |  |
Aircraft [Domain] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Finance Lease, Number of Aircraft Leases | aircraft | 6 |  |  |  |  |
Finance Lease, Right-of-Use Asset | $ 250,000,000 | $ 253,000,000 |  |  |  |
Finance Lease, Liability, Payments, Due Next Twelve Months | 35,000,000 |  |  |  |  |
Finance Lease, Liability, Payments, Due Year Two | 39,000,000 |  |  |  |  |
Finance Lease, Liability, Payments, Due Year Three | 9,000,000 |  |  |  |  |
Finance Lease, Liability, Payments, Due Year Four | 9,000,000 |  |  |  |  |
Finance Lease, Liability, Payments, Due Year Five | 5,000,000 |  |  |  |  |
Finance Lease, Liability, Payments, Due after Year Five | $ 0 |  |  |  |  |
A-320 [Member] | Secured Debt [Member] | Floating rate equipment notes due through 2028 [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Number of New Aircraft Held As Security | aircraft |  | 6 |  |  |  |
A-320 [Member] | Secured Debt [Member] | Fixed rate equipment notes due through 2028 [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Number of New Aircraft Held As Security | aircraft | 10 | 14 |  |  |  |
A-321 [Member] | Secured Debt [Member] | Floating rate equipment notes due through 2028 [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Number of New Aircraft Held As Security | aircraft |  | 1 |  |  |  |
A-321 [Member] | Secured Debt [Member] | Fixed rate equipment notes due through 2028 [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Number of New Aircraft Held As Security | aircraft | 2 | 10 |  |  |  |
A-321 [Member] | Fixed rate enhanced equipment notes, due through 2023 [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Number of New Aircraft Held As Security | aircraft |  |  |  | 25 |  |

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- Definition The carrying amount, as of the date of the latest financial statement presented, of flight equipment which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References No definition available. + Details
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- Definition Amount of lessee's right to use underlying asset under finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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