XML 82 R71.htm IDEA: XBRL DOCUMENT
v3.23.1

Financial Instruments - Seller Earnouts - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value of seller earnouts | $ 109 |  | $ 96
Loss (gain) from change in fair value of seller earnouts | (13) | $ 14 |
Common Class Z [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Loss (gain) from change in fair value of seller earnouts | $ 12 | $ 1 |
Seller Earnouts Liability |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Business combination, contingent consideration, liability expected holding period | 5 years 3 months 3 days |  |
Seller Earnouts Liability | Volatility |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement Input | 50 |  |
Seller Earnouts Liability | Risk-free Interest Rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement Input | 3.59 |  |

X
- Definition Business combination, contingent consideration, liability expected holding period. + References No definition available. + Details
Name: | alit_BusinessCombinationContingentConsiderationLiabilityExpectedHoldingPeriod
Namespace Prefix: | alit_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The seller earnout fair value of shares that would be issued, determined under the conditions specified in the contract if the settlement were to occur at the reporting date. + References No definition available. + Details
Name: | alit_FinancialInstrumentsSubjectToMandatoryRedemptionSettlementTermsSellerEarnOutFairValueOfShares
Namespace Prefix: | alit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loss (gain) from change in fair value of seller earnouts. + References No definition available. + Details
Name: | alit_LossGainFromChangeInFairValueOfSellerEarnouts
Namespace Prefix: | alit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Value of input used to measure contingent consideration liability from business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=alit_CommonClassZMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=alit_SellerEarnoutsLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPriceVolatilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputRiskFreeInterestRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |