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Debt - Details of Pass Through Trusts (Details) - USD ($)

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Debt Instrument [Line Items]

Proceeds received from issuance of debt

$ 646,000,000

$ 673,000,000

^[1]

United Airlines, Inc.

Debt Instrument [Line Items]

Proceeds received from issuance of debt

646,000,000

$ 673,000,000

^[2]

United Airlines, Inc. | Class AA Pass Through Certificates | February 2019

Debt Instrument [Line Items]

Principal

$ 717,000,000

Stated interest rate

4.15%

Total debt recorded

$ 522,000,000

Proceeds received from issuance of debt

522,000,000

Remaining proceeds from issuance of debt to be received in future periods

195,000,000

United Airlines, Inc. | Class A Pass Through Certificates | February 2019

Debt Instrument [Line Items]

Principal

$ 296,000,000

Stated interest rate

4.55%

Total debt recorded

$ 216,000,000

Proceeds received from issuance of debt

216,000,000

Remaining proceeds from issuance of debt to be received in future periods

80,000,000

United Airlines, Inc. | ETTC

Debt Instrument [Line Items]

Principal

1,013,000,000

Total debt recorded

738,000,000

Proceeds received from issuance of debt

738,000,000

Remaining proceeds from issuance of debt to be received in future periods

$ 275,000,000

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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