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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) employee aircraft | Jul. 31, 2018 aircraft
Commitments and Contingencies [Line Items] |  |
Operating leases obligations | $ 13,275 |
United Airlines, Inc. |  |
Commitments and Contingencies [Line Items] |  |
Principal | $ 1,161 |
Number of employees | employee | 91,400 |
Percentage of employees represented by various U.S. labor organizations | 80.00% |
Tax-exempt special facilities revenue bonds |  |
Commitments and Contingencies [Line Items] |  |
Guarantor obligations, maximum exposure | $ 2,000 |
Operating leases obligations | 1,400 |
Capital leases obligations | 454 |
Floating Rate Debt |  |
Commitments and Contingencies [Line Items] |  |
Principal | 3,300 |
Fixed Rate Debt |  |
Commitments and Contingencies [Line Items] |  |
Principal | 44 |
Loans And Leases From Non U S Entities |  |
Commitments and Contingencies [Line Items] |  |
Aggregate balance | 3,200 |
Aircraft Mortgage Debt |  |
Commitments and Contingencies [Line Items] |  |
Guarantor obligations, maximum exposure | $ 151 |
Maximum |  |
Commitments and Contingencies [Line Items] |  |
Debt instrument, remaining terms (years) | 11 years |
Maximum | Loans And Leases From Non U S Entities |  |
Commitments and Contingencies [Line Items] |  |
Debt instrument, remaining terms (years) | 11 years |
Boeing 787 |  |
Commitments and Contingencies [Line Items] |  |
Number of aircrafts expects to take delivery | aircraft | 3 |
Boeing 737 MAX |  |
Commitments and Contingencies [Line Items] |  |
Number of aircrafts expects to take delivery | aircraft | 4 |
Boeing 777-300ER Aircraft |  |
Commitments and Contingencies [Line Items] |  |
Number of aircraft expected to be delivered through the remainder of 2018 | aircraft | 1 |
Boeing 767-300ER Aircraft |  |
Commitments and Contingencies [Line Items] |  |
Number of aircraft expected to be delivered through the remainder of 2018 | aircraft | 3 |
Embraer E175 | Subsequent Event |  |
Commitments and Contingencies [Line Items] |  |
Number of aircraft committed to purchase | aircraft |  | 25
Airbus A319 Aircraft |  |
Commitments and Contingencies [Line Items] |  |
Number of aircraft committed to purchase | aircraft | 20 |
Chicago O'Hare International Airport | March 2018 Facility and Other Operating Leases |  |
Commitments and Contingencies [Line Items] |  |
Operating lease agreement term | 15 years |
Chicago O'Hare International Airport | Minimum | May 2018 Facility and Other Operating Leases |  |
Commitments and Contingencies [Line Items] |  |
Operating lease agreement term | 15 years |
Chicago O'Hare International Airport | Maximum | May 2018 Facility and Other Operating Leases |  |
Commitments and Contingencies [Line Items] |  |
Operating lease agreement term | 30 years |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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