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Long-term Debt, Short-term Borrowings and Finance Lease Obligations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Apr. 22, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Reduction in outstanding debt and capital lease obligations	$ 102
Value of aircraft, engines and other equipment and facilities which were pledged as security under various loan agreements	5,600
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	235
Long-term debt, maturities, repayments of principal in Year Two	1,300
Long-term debt, maturities, repayments of principal in Year Three	319
Long-term debt, maturities, repayments of principal in Year Four	298
Long-term debt, maturities, repayments of principal in Year Five	169
Long-term debt, maturities, repayments of principal after Year Five	867
Carrying amounts and estimated fair values of long-term debt
Carrying Value, Total	2,151		$ 2,245
Estimated Fair Value, Total	1,886		2,367
Public Debt Fixed Rate Special Facility Bonds Due Through Two Thousand Thirty Six [Member]
Carrying amounts and estimated fair values of long-term debt
Carrying Value, Total	42		42
Estimated Fair Value, Total	39		46
Fixed rate enhanced equipment notes, due through 2032 [Member]
Carrying amounts and estimated fair values of long-term debt
Carrying Value, Total	581		581
Estimated Fair Value, Total	409		586
Fixed rate enhanced equipment notes, due through 2028 [Member]
Carrying amounts and estimated fair values of long-term debt
Carrying Value, Total	181		181
Estimated Fair Value, Total	144		186
Non Public Debt Fixed Rate Enhanced Equipment Notes Due Through Two Thousand And Twenty Three [Member]
Carrying amounts and estimated fair values of long-term debt
Carrying Value, Total	125		133
Estimated Fair Value, Total	124		141
Non Public Debt Floating Rate Equipment Notes Due Through Two Thousand And Twenty Eight [Member]
Carrying amounts and estimated fair values of long-term debt
Carrying Value, Total	187		201
Estimated Fair Value, Total	169		207
Non Public Debt Fixed Rate Equipment Notes Due Through Two Thousand Twenty Eight [Member]
Carrying amounts and estimated fair values of long-term debt
Carrying Value, Total	1,035		1,107
Estimated Fair Value, Total	1,001		1,201
Citibank [Member]
Carrying amounts and estimated fair values of long-term debt
Line of Credit, Current	0		0
Morgan Stanley [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	200
Carrying amounts and estimated fair values of long-term debt
Line of Credit, Current	$ 0		$ 0
London Interbank Offered Rate (LIBOR) [Member] | Citibank [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	LIBOR, plus a margin
London Interbank Offered Rate (LIBOR) [Member] | Morgan Stanley [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	LIBOR, plus a margin
Short-term Debt [Member] | Morgan Stanley [Member]
Carrying amounts and estimated fair values of long-term debt
Debt Instrument, Face Amount	$ 1,000
Short-term Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Morgan Stanley [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	LIBOR (but not less than 1% per annum), plus a margin
Debt Instrument, Basis Spread on Variable Rate	1.75%
Subsequent Event [Member] | Citibank [Member]
Carrying amounts and estimated fair values of long-term debt
Line of Credit, Current		$ 550

X

- 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.

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Scheduled maturities, Remainder of Fiscal Year, short-term borrowings, long-term debt, and finance lease obligations

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Scheduled maturities, Year 2, short-term borrowings, long-term debt, and finance lease obligations

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Scheduled maturities, Year 3, short-term borrowings, long-term debt, and finance lease obligations

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Scheduled maturities, Year 4, short-term borrowings, long-term debt, and finance lease obligations

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Scheduled maturities, Year 5, short-term borrowings, long-term debt, and finance lease obligations

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Scheduled maturities, after Year 5, short-term borrowings, long-term debt, and finance lease obligations

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Face (par) amount of debt instrument at time of issuance.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The carrying value as of the balance sheet date of the current portion 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.

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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.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of cash outflow for short-term and long-term debt and lease obligation.

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