Debt - Components of Long-Term Debt - Equipment Loans and Other Notes Payable Issued in 2018 (Details) $ in Millions	6 Months Ended
Jun. 30, 2018 USD ($)
Debt Instrument [Line Items]
Proceeds from notes payable	$ 509
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Proceeds from notes payable	$ 509

The cash inflow from borrowings supported by a written promise to pay an obligation that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

Name:	us-gaap_ProceedsFromSecuredNotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration