XML 105 R81.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Debt (Parenthetical) (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017 | Jan. 30, 2017
Notes payable, fixed interest rates of 2.88% to 9.52% (weighted average rate of 4.39% as of December 31, 2017), payable through 2028 | United Airlines, Inc. | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  | 4.39% |  |  |
Debt instrument, maturity date |  | 2028 | 2028 |  |
Notes payable, fixed interest rates of 2.88% to 9.52% (weighted average rate of 4.39% as of December 31, 2017), payable through 2028 | United Airlines, Inc. | Secured Debt | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest rate |  | 2.88% |  |  |
Notes payable, fixed interest rates of 2.88% to 9.52% (weighted average rate of 4.39% as of December 31, 2017), payable through 2028 | United Airlines, Inc. | Secured Debt | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest rate |  | 9.52% |  |  |
Notes payable, floating interest rates of the London interbank offered rate ("LIBOR") plus 0.2% to 2.25%, payable through 2028 | United Airlines, Inc. | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, maturity date |  | 2028 | 2028 |  |
Notes payable, floating interest rates of the London interbank offered rate ("LIBOR") plus 0.2% to 2.25%, payable through 2028 | United Airlines, Inc. | Secured Debt | LIBOR | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.20% |  |  |
Notes payable, floating interest rates of the London interbank offered rate ("LIBOR") plus 0.2% to 2.25%, payable through 2028 | United Airlines, Inc. | Secured Debt | LIBOR | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.25% |  |  |
Term Loan Facility Due 2024 | United Airlines, Inc. | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, maturity date |  | 2024 |  |  |
Term Loan Facility Due 2024 | United Airlines, Inc. | Secured Debt | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.00% |  |  |
Term Loan Facility Due 2024 | United Airlines, Inc. | Secured Debt | Certain Market Interest Rates |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.00% |  |  |
Term Loan Facility Due April 2019 | United Airlines, Inc. | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, maturity date |  | 2019 | 2019 |  |
Term Loan Facility Due April 2019 | United Airlines, Inc. | Secured Debt | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.50% | 2.50% |  |
Term Loan Facility Due April 2019 | United Airlines, Inc. | Secured Debt | Certain Market Interest Rates |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.50% | 1.50% |  |
Term Loan Facility Due April 2019 | United Airlines, Inc. | Secured Debt | Interest Rate Floor |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.75% | 0.75% |  |
Term Loan Facility Due September 2021 | United Airlines, Inc. | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, maturity date |  | 2021 | 2021 |  |
Term Loan Facility Due September 2021 | United Airlines, Inc. | Secured Debt | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.75% | 2.75% |  |
Term Loan Facility Due September 2021 | United Airlines, Inc. | Secured Debt | Certain Market Interest Rates |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.75% | 1.75% |  |
Term Loan Facility Due September 2021 | United Airlines, Inc. | Secured Debt | Interest Rate Floor |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.75% | 0.75% |  |
6.375% Senior Notes due 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest rate |  | 6.375% |  |  |
6.375% Senior Notes due 2018 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest rate | [1] | 6.375% | 6.375% |  |
Debt instrument, maturity date | [1] | 2018 | 2018 |  |
6% Senior Notes due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest rate |  | 6.00% |  |  |
6% Senior Notes due 2020 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest rate | [1] | 6.00% | 6.00% |  |
Debt instrument, maturity date | [1] | 2020 | 2020 |  |
4.25% Senior Notes due 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest rate |  | 4.25% |  |  |
4.25% Senior Notes due 2022 | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest rate |  |  |  | 4.25% |
4.25% Senior Notes due 2022 | United Airlines, Inc. | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest rate | [1] | 4.25% | 4.25% |  |
Debt instrument, maturity date | [1] | 2022 | 2022 |  |
5% Senior Notes due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest rate |  | 5.00% |  |  |
5% Senior Notes due 2024 | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest rate |  |  |  |  | 5.00%
5% Senior Notes due 2024 | United Airlines, Inc. | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest rate | [1] | 5.00% | 5.00% |  |
Debt instrument, maturity date | [1] | 2024 | 2024 |  |
[1] | UAL is the issuer of this debt. United is a guarantor.

X
- Definition Debt instrument maturity year + References No definition available. + Details
Name: | ual_DebtInstrumentMaturityYear
Namespace Prefix: | ual_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average interest rate of long-term debt outstanding calculated at point in time. + References No definition available. + Details
Name: | us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ual_NotesPayableFixedInterestRateOfTwoPointEightEightPercentToNinePointFiveTwoPercentPayableThroughTwoThousandTwentyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ual_UnitedAirLinesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ual_NotesPayableFloatingInterestRatesOfLiborPlusZeroPointTwoPercentToTwoPointTwoFivePercentPayableThroughTwoThousandTwentyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ual_TermLoanFacilityDueTwentyTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=ual_CertainMarketInterestRatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ual_TermLoanFacilityDueAprilTwentyNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=ual_FloorRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ual_TermLoanFacilityDueSeptemberTwentyTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ual_SixPointThreeSevenFivePercentSeniorNotesDueTwentyEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ual_SeniorNotesSixPercentDueTwentyTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ual_FourPointTwoFivePercentSeniorNotesDueTwentyTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ual_FivePercentSeniorNotesDueTwentyTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |