Investments - Equity Method Investments (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jan. 31, 2020	Dec. 31, 2019
LATAM
Equity Method Investments
Ownership interest (percent)	20.00%		0.00%
Carrying value	$ 1,088	$ 1,100	$ 0
Grupo Aeromexico
Equity Method Investments
Ownership interest (percent)	51.00%		51.00%
Carrying value	$ 770		$ 833
Voting interest limit per bylaws (percent)	49.00%
Virgin Atlantic
Equity Method Investments
Ownership interest (percent)	49.00%		49.00%
Carrying value	$ 207		$ 375
AirCo
Equity Method Investments
Ownership interest (percent)	49.00%		49.00%
Carrying value	$ 141		$ 142

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant