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Debt - Narrative (Details)		1 Months Ended			2 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
Debt - Narrative (Details)	Apr. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) $ / shares	Apr. 30, 2020 USD ($)	Jan. 31, 2020 USD ($)	May 31, 2020 USD ($)	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019	Feb. 29, 2020 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt								$ 9,464,000,000	$ 2,589,000,000
Costs of issuance								84,000,000	23,000,000
Approved financial assistance under the CARES Act		$ 5,800,000,000				$ 5,800,000,000		$ 5,800,000,000
Effective interest rate		20.00%				20.00%		20.00%
Interest expense						$ 254,000,000	$ 275,000,000	$ 512,000,000	546,000,000
Payroll Support Program Promissory Note [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued		$ 1,500,000,000				$ 1,500,000,000		$ 1,500,000,000
Secured Debt [Member] \| 11.75% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		11.75%				11.75%		11.75%
Secured Debt [Member] \| Equipment Loans and Other Notes Payable [Member]
Debt Instrument [Line Items]
Average interest rate		3.02%				3.02%		3.02%
Senior Notes [Member] \| Special Facility Revenue Bonds [Member]
Debt Instrument [Line Items]
Repayments of long-term debt								$ 47,000,000
Senior Notes [Member] \| 6.50% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		6.50%				6.50%		6.50%
Debt instrument, aggregate principal issued		$ 1,000,000,000				$ 1,000,000,000		$ 1,000,000,000
Issuance price percentage								100.00%
Debt redemption price percentage								100.00%
Proceeds from issuance of long-term debt		970,000,000
Term of underwriters option								30 days
Underwriters option to purchase		$ 150,000,000				$ 150,000,000		$ 150,000,000
Conversion ratio								0.0617284
Conversion price (in dollars per share) \| $ / shares		$ 16.20				$ 16.20		$ 16.20
Conversion terms, percentage sales price exceeds conversion price								130.00%
Measurement period threshold trading price percentage								98.00%
Percent of holders that may declare debt due and payable								25.00%
Interest expense						$ 2,000,000
Amortization of debt discount						1,000,000
Contractual coupon interest						1,000,000
Expected amortization of debt discount, 2020		$ 27,000,000				27,000,000		$ 27,000,000
Expected amortization of debt discount, 2021		63,000,000				63,000,000		63,000,000
Expected amortization of debt discount, 2022		77,000,000				77,000,000		77,000,000
Expected amortization of debt discount, 2023		95,000,000				95,000,000		95,000,000
Expected amortization of debt discount, 2024		116,000,000				116,000,000		116,000,000
Expected amortization of debt discount, 2025		66,000,000				66,000,000		66,000,000
Senior Notes [Member] \| 3.75% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate											3.75%
Debt instrument, aggregate principal issued											$ 500,000,000
Revolving Credit Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity		400,000,000				400,000,000		400,000,000
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt								6,868,000,000	1,839,000,000
Costs of issuance								75,000,000	13,000,000
Interest expense						255,000,000	$ 277,000,000	515,000,000	$ 554,000,000
American Airlines, Inc. [Member] \| Secured Debt [Member] \| Delayed Draw Term Loan Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,000,000,000.0				$ 1,000,000,000.0		$ 1,000,000,000.0
Term								364 days
American Airlines, Inc. [Member] \| Secured Debt [Member] \| Delayed Draw Term Loan Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate, floor		100.00%
American Airlines, Inc. [Member] \| Secured Debt [Member] \| 11.75% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		11.75%				11.75%		11.75%
Issuance price percentage		99.00%
Debt redemption price percentage		100.00%
American Airlines, Inc. [Member] \| Secured Debt [Member] \| Special Facility Revenue Bonds [Member]
Debt Instrument [Line Items]
Issuance price percentage		98.00%
Proceeds from issuance of long-term debt		$ 353,000,000
Costs of issuance		8,000,000
Repayments of long-term debt		47,000,000
Reimbursement of costs		$ 17,000,000
American Airlines, Inc. [Member] \| Secured Debt [Member] \| 5.25% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		5.25%				5.25%		5.25%
Debt instrument, aggregate principal issued		$ 214,000,000				$ 214,000,000		$ 214,000,000
American Airlines, Inc. [Member] \| Secured Debt [Member] \| 5.375% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		5.375%				5.375%		5.375%
Debt instrument, aggregate principal issued		$ 146,000,000				$ 146,000,000		$ 146,000,000
American Airlines, Inc. [Member] \| Secured Debt [Member] \| Equipment Loans and Other Notes Payable Maturing 2029 Through 2032 [Member]
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt								$ 197,000,000
Average interest rate		2.27%				2.27%		2.27%
American Airlines, Inc. [Member] \| Secured Debt [Member] \| Equipment Loans and Other Notes Payable [Member]
Debt Instrument [Line Items]
Repayments of long-term debt								$ 17,000,000
Average interest rate		2.20%				2.20%		2.20%
American Airlines, Inc. [Member] \| Senior Notes [Member] \| 11.75% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		11.75%				11.75%		11.75%
Debt instrument, aggregate principal issued		$ 2,500,000,000				$ 2,500,000,000		$ 2,500,000,000
American Airlines, Inc. [Member] \| Senior Notes [Member] \| Special Facility Revenue Bonds [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued		360,000,000				360,000,000		360,000,000
American Airlines, Inc. [Member] \| Revolving Credit Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity		400,000,000				400,000,000		400,000,000
American Airlines, Inc. [Member] \| Revolving Credit Facility [Member] \| Secured Debt [Member] \| 2014 Credit Facilities [Member]
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity					$ 0
Line of credit facility, maximum borrowing capacity		1,200,000,000				1,200,000,000		1,200,000,000
Borrowings from credit facilities					$ 1,600,000,000
American Airlines, Inc. [Member] \| Revolving Credit Facility [Member] \| Secured Debt [Member] \| 2014 Credit Facilities [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				1.75%						2.00%
Basis spread on variable rate, floor				0.00%
Stated interest rate					2.00%
American Airlines, Inc. [Member] \| Revolving Credit Facility [Member] \| Secured Debt [Member] \| 2014 Credit Facilities [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				0.75%						1.00%
American Airlines, Inc. [Member] \| Revolving Credit Facility [Member] \| Secured Debt [Member] \| 2013 Credit Facilities [Member]
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	$ 0		$ 0
Borrowings from credit facilities			$ 750,000,000
American Airlines, Inc. [Member] \| Revolving Credit Facility [Member] \| Secured Debt [Member] \| 2013 Credit Facilities [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Stated interest rate	2.00%		2.00%
United States Government [Member]
Debt Instrument [Line Items]
Approved financial assistance under the CARES Act	$ 5,800,000,000		$ 5,800,000,000
United States Government [Member] \| Payroll Support Program Promissory Note [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued	$ 842,000,000	1,700,000,000	$ 842,000,000			1,700,000,000		1,700,000,000
Increase in debt instrument face amount for each disbursement received	30.00%
United States Government [Member] \| Secured Debt [Member] \| Payroll Support Program Promissory Note [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued		$ 1,500,000,000				$ 1,500,000,000		$ 1,500,000,000
Interest Rate First Five Years [Member] \| United States Government [Member] \| Payroll Support Program Promissory Note [Member]
Debt Instrument [Line Items]
Stated interest rate	1.00%		1.00%
Interest Rate Years Six Through Ten [Member] \| United States Government [Member] \| Payroll Support Program Promissory Note [Member] \| Secured Overnight Financing Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Basis spread on variable rate, floor	0.00%
JFK Airport upgrade [Member]
Debt Instrument [Line Items]
Construction project investment amount				$ 344,000,000
JFK Airport upgrade [Member] \| American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Construction project investment amount				$ 344,000,000