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Defined Benefit Plan, Expected Future Employer Contributions, Delayed

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Employee Related Cost Reductions, Number Of Employees Volunteering For Leave

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Employee Related Cost Reductions, Percentage, Reduction In Work Hours, Management And Employee Groups

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Employee Related Cost Reductions, Percentage, Salary Reduction, Company Officers

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Employee Related Cost Reductions, Percentage, Salary Reduction, Director Level Employees

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Employee Related Cost Reductions, Voluntary Unpaid Leave

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Expected Year-Over-Year Decrease In System Capacity, Percentage

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Impact Of Global Pandemic

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Number Of Aircraft Removed From Active Service

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Proceeds From Sale Leaseback

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Reduction In Planned Capital Expenditures

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Temporary Parking Of Fleet, Percentage

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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

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The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Impact of the COVID-19 Pandemic - Narrative (Details)	1 Months Ended	3 Months Ended		6 Months Ended
Impact of the COVID-19 Pandemic - Narrative (Details)	Apr. 22, 2020 USD ($)	Jun. 30, 2020 aircraft	Mar. 31, 2020 USD ($) numberOfEmployees aircraft	Jun. 30, 2020 aircraft	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
Impact Of Global Pandemic [Line Items]
Number of aircraft removed from active service \| aircraft			400
Number of employees volunteering for leave \| numberOfEmployees			35,000
Salary reduction for company officers (percent)			50.00%
Salary reduction for director-level employees (percent)			25.00%
Work hours reduction for management and most front-line employee work groups (percent)			25.00%
Cash and cash equivalents			$ 5,967,000,000		$ 2,882,000,000	$ 1,910,000,000
Reduction in planned capital expenditures			3,500,000,000
Loans secured by certain widebody aircraft			150,000,000
Delay in planned voluntary pension funding			500,000,000
Unencumbered assets			$ 15,000,000,000
Minimum
Impact Of Global Pandemic [Line Items]
Voluntary unpaid leave duration			30 days
Maximum
Impact Of Global Pandemic [Line Items]
Voluntary unpaid leave duration			12 months
2020 Secured Term Loan Facility \| Term Loan
Impact Of Global Pandemic [Line Items]
Debt instrument amount			$ 2,700,000,000
Revolving Credit Facility
Impact Of Global Pandemic [Line Items]
Proceeds from revolving credit facilities			$ 3,000,000,000.0
Subsequent Event \| Aircraft sale leaseback
Impact Of Global Pandemic [Line Items]
Sale leaseback transactions	$ 1,200,000,000
Subsequent Event \| 2020 Secured Term Loan Facility \| Term Loan
Impact Of Global Pandemic [Line Items]
Debt instrument amount	$ 3,000,000,000.0
Forecast
Impact Of Global Pandemic [Line Items]
Expected year-over-year decrease In system capacity (percent)		85.00%
Percentage of fleet temporarily parked (percent)		50.00%
Number of aircraft removed from active service \| aircraft		250		650
International \| Forecast
Impact Of Global Pandemic [Line Items]
Expected year-over-year decrease In system capacity (percent)		90.00%
Domestic \| Forecast
Impact Of Global Pandemic [Line Items]
Expected year-over-year decrease In system capacity (percent)		80.00%