3.25.0.1 html 334 478 1 false 106 0 false 7 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - Consolidated Balance Sheets Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_StatementConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 100030 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_StatementConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 100040 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_StatementConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 4 false false R5.htm 100050 - Statement - Consolidated Statements of Cash Flows Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 5 false false R6.htm 100060 - Statement - Consolidated Statements of Stockholders' Equity Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_StatementConsolidatedStatementsOfStockholdersEquity Consolidated Statements of Stockholders' Equity Statements 6 false false R7.htm 100070 - Statement - Consolidated Statements of Stockholders' Equity (Parenthetical) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquityParenthetical Consolidated Statements of Stockholders' Equity (Parenthetical) Statements 7 false false R8.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 8 false false R9.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 9 false false R10.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 10 false false R11.htm 995457 - Disclosure - Cybersecurity Risk Management, Strategy, and Governance Disclosure Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureCybersecurityRiskManagementStrategyAndGovernanceDisclosure Cybersecurity Risk Management, Strategy, and Governance Disclosure Notes 11 false false R12.htm 995467 - Disclosure - Overview Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureOverview Overview Notes 12 false false R13.htm 995477 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 13 false false R14.htm 995487 - Disclosure - Revenue Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureRevenue Revenue Notes 14 false false R15.htm 995497 - Disclosure - Inventories Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureInventories Inventories Notes 15 false false R16.htm 995507 - Disclosure - Property, Plant and Equipment Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipment Property, Plant and Equipment Notes 16 false false R17.htm 995517 - Disclosure - Goodwill and Other Intangible Assets Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureGoodwillAndOtherIntangibleAssets Goodwill and Other Intangible Assets Notes 17 false false R18.htm 995527 - Disclosure - Fair Value of Financial Instruments Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureFairValueOfFinancialInstruments Fair Value of Financial Instruments Notes 18 false false R19.htm 995537 - Disclosure - Debt Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDebt Debt Notes 19 false false R20.htm 995547 - Disclosure - Derivatives Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDerivatives Derivatives Notes 20 false false R21.htm 995557 - Disclosure - Product Warranty Liabilities Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureProductWarrantyLiabilities Product Warranty Liabilities Notes 21 false false R22.htm 995567 - Disclosure - Deferred Revenue Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDeferredRevenue Deferred Revenue Notes 22 false false R23.htm 995577 - Disclosure - Leases Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureLeases Leases Notes 23 false false R24.htm 995587 - Disclosure - Other (Expense) Income, Net Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureOtherExpenseIncomeNet1 Other (Expense) Income, Net Notes 24 false false R25.htm 995597 - Disclosure - Other Current Liabilities Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureOtherCurrentLiabilities Other Current Liabilities Notes 25 false false R26.htm 995607 - Disclosure - Employee Benefit Plans Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlans Employee Benefit Plans Notes 26 false false R27.htm 995617 - Disclosure - Income Taxes Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxes Income Taxes Notes 27 false false R28.htm 995627 - Disclosure - Accumulated Other Comprehensive Loss Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLoss Accumulated Other Comprehensive Loss Notes 28 false false R29.htm 995637 - Disclosure - Commitments and Contingencies Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 29 false false R30.htm 995647 - Disclosure - Concentration of Risk Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureConcentrationOfRisk Concentration of Risk Notes 30 false false R31.htm 995657 - Disclosure - Common Stock Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureCommonStock Common Stock Notes 31 false false R32.htm 995667 - Disclosure - Earnings Per Share Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureEarningsPerShare Earnings Per Share Notes 32 false false R33.htm 995677 - Disclosure - Geographic Information Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureGeographicInformation Geographic Information Notes 33 false false R34.htm 995687 - Disclosure - Segment Information Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureSegmentInformation Segment Information Notes 34 false false R35.htm 995707 - Disclosure - Schedule I-Parent Company Only Financial Statements Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureScheduleIParentCompanyOnlyFinancialStatements Schedule I-Parent Company Only Financial Statements Notes 35 false false R36.htm 995717 - Disclosure - Schedule I-Parent Company Only Financial Statements - BASIS OF PRESENTATION Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureScheduleIParentCompanyOnlyFinancialStatementsBASISOFPRESENTATION Schedule I-Parent Company Only Financial Statements - BASIS OF PRESENTATION Notes 36 false false R37.htm 995727 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 37 false false R38.htm 995737 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 38 false false R39.htm 995747 - Disclosure - Revenue (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureRevenueTables Revenue (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureRevenue 39 false false R40.htm 995757 - Disclosure - Inventories (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureInventoriesTables Inventories (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureInventories 40 false false R41.htm 995767 - Disclosure - Property, Plant and Equipment (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentTables Property, Plant and Equipment (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipment 41 false false R42.htm 995777 - Disclosure - Goodwill and Other Intangible Assets (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureGoodwillAndOtherIntangibleAssetsTables Goodwill and Other Intangible Assets (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureGoodwillAndOtherIntangibleAssets 42 false false R43.htm 995787 - Disclosure - Fair Value of Financial Instruments (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsTables Fair Value of Financial Instruments (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureFairValueOfFinancialInstruments 43 false false R44.htm 995797 - Disclosure - Debt (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDebtTables Debt (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDebt 44 false false R45.htm 995807 - Disclosure - Derivatives (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDerivativesTables Derivatives (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDerivatives 45 false false R46.htm 995817 - Disclosure - Product Warranty Liabilities (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureProductWarrantyLiabilitiesTables Product Warranty Liabilities (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureProductWarrantyLiabilities 46 false false R47.htm 995827 - Disclosure - Deferred Revenue (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDeferredRevenueTables Deferred Revenue (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDeferredRevenue 47 false false R48.htm 995837 - Disclosure - Leases (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureLeasesTables Leases (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureLeases 48 false false R49.htm 995847 - Disclosure - Other (Expense) Income, Net (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureOtherExpenseIncomeNetTables Other (Expense) Income, Net (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureOtherExpenseIncomeNet1 49 false false R50.htm 995857 - Disclosure - Other Current Liabilities (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureOtherCurrentLiabilitiesTables Other Current Liabilities (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureOtherCurrentLiabilities 50 false false R51.htm 995867 - Disclosure - Employee Benefit Plans (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables Employee Benefit Plans (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureEmployeeBenefitPlans 51 false false R52.htm 995877 - Disclosure - Income Taxes (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxes 52 false false R53.htm 995887 - Disclosure - Accumulated Other Comprehensive Loss (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLossTables Accumulated Other Comprehensive Loss (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLoss 53 false false R54.htm 995897 - Disclosure - Concentration of Risk (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureConcentrationOfRiskTables Concentration of Risk (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureConcentrationOfRisk 54 false false R55.htm 995907 - Disclosure - Earnings Per Share (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureEarningsPerShareTables Earnings Per Share (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureEarningsPerShare 55 false false R56.htm 995917 - Disclosure - Geographic Information (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureGeographicInformationTables Geographic Information (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureGeographicInformation 56 false false R57.htm 995927 - Disclosure - Segment Information (Tables) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureSegmentInformationTables Segment Information (Tables) Tables http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureSegmentInformation 57 false false R58.htm 995937 - Disclosure - Overview - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureOverviewAdditionalInformationDetails Overview - Additional Information (Details) Details 58 false false R59.htm 995947 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails Summary of Significant Accounting Policies - Additional Information (Details) Details 59 false false R60.htm 995957 - Disclosure - Summary of Significant Accounting Policies - Property Plant and Equipment Estimated Lives (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPropertyPlantAndEquipmentEstimatedLivesDetails Summary of Significant Accounting Policies - Property Plant and Equipment Estimated Lives (Details) Details 60 false false R61.htm 995967 - Disclosure - Revenue - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureRevenueAdditionalInformationDetails Revenue - Additional Information (Details) Details 61 false false R62.htm 995977 - Disclosure - Revenue - Disaggregated Revenue by Categories (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureRevenueDisaggregatedRevenueByCategoriesDetails Revenue - Disaggregated Revenue by Categories (Details) Details 62 false false R63.htm 995987 - Disclosure - Inventories - Schedule of Components of Inventories (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureInventoriesScheduleOfComponentsOfInventoriesDetails Inventories - Schedule of Components of Inventories (Details) Details 63 false false R64.htm 995997 - Disclosure - Property, Plant and Equipment - Schedule of Property Plant and Equipment Cost and Accumulated Depreciation (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentCostAndAccumulatedDepreciationDetails Property, Plant and Equipment - Schedule of Property Plant and Equipment Cost and Accumulated Depreciation (Details) Details 64 false false R65.htm 996007 - Disclosure - Property, Plant and Equipment - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentAdditionalInformationDetails Property, Plant and Equipment - Additional Information (Details) Details 65 false false R66.htm 996017 - Disclosure - Goodwill And Other Intangible Assets - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetails Goodwill And Other Intangible Assets - Additional Information (Details) Details 66 false false R67.htm 996027 - Disclosure - Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureGoodwillAndOtherIntangibleAssetsScheduleOfOtherIntangibleAssetsDetails Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Details) Details 67 false false R68.htm 996037 - Disclosure - Goodwill and Other Intangible Assets - Schedule of Amortization Expense Related to Other Intangible Assets for Next Five Fiscal Years (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureGoodwillAndOtherIntangibleAssetsScheduleOfAmortizationExpenseRelatedToOtherIntangibleAssetsForNextFiveFiscalYearsDetails Goodwill and Other Intangible Assets - Schedule of Amortization Expense Related to Other Intangible Assets for Next Five Fiscal Years (Details) Details 68 false false R69.htm 996047 - Disclosure - Fair Value of Financial Instruments - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetails Fair Value of Financial Instruments - Additional Information (Details) Details 69 false false R70.htm 996057 - Disclosure - Fair Value of Financial Instruments - Summary of Fair Value of Financial Assets and (Liabilities) (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsSummaryOfFairValueOfFinancialAssetsAndLiabilitiesDetails Fair Value of Financial Instruments - Summary of Fair Value of Financial Assets and (Liabilities) (Details) Details 70 false false R71.htm 996067 - Disclosure - Debt - Summary of Long-Term Debt and Maturities (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDebtSummaryOfLongTermDebtAndMaturitiesDetails Debt - Summary of Long-Term Debt and Maturities (Details) Details 71 false false R72.htm 996077 - Disclosure - Debt - Summary of Long-Term Debt and Maturities (Parenthetical) (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDebtSummaryOfLongTermDebtAndMaturitiesParentheticalDetails Debt - Summary of Long-Term Debt and Maturities (Parenthetical) (Details) Details 72 false false R73.htm 996087 - Disclosure - Debt - Principal Payments Required on Long Term Debt (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDebtPrincipalPaymentsRequiredOnLongTermDebtDetails Debt - Principal Payments Required on Long Term Debt (Details) Details 73 false false R74.htm 996097 - Disclosure - Debt - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDebtAdditionalInformationDetails Debt - Additional Information (Details) Details 74 false false R75.htm 996107 - Disclosure - Debt - Senior Secured Credit Facility - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureDebtSeniorSecuredCreditFacilityAdditionalInformationDetails Debt - Senior Secured Credit Facility - Additional Information (Details) Details 75 false false R76.htm 996117 - Disclosure - Derivatives - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDerivativesAdditionalInformationDetails Derivatives - Additional Information (Details) Details 76 false false R77.htm 996137 - Disclosure - Derivatives - Derivative Instruments and their Impact on Financial Condition (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDerivativesDerivativeInstrumentsAndTheirImpactOnFinancialConditionDetails Derivatives - Derivative Instruments and their Impact on Financial Condition (Details) Details 77 false false R78.htm 996147 - Disclosure - Product Warranty Liabilities - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureProductWarrantyLiabilitiesAdditionalInformationDetails Product Warranty Liabilities - Additional Information (Details) Details 78 false false R79.htm 996157 - Disclosure - Product Warranty Liabilities - Product Warranty Liability Activities (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureProductWarrantyLiabilitiesProductWarrantyLiabilityActivitiesDetails Product Warranty Liabilities - Product Warranty Liability Activities (Details) Details 79 false false R80.htm 996167 - Disclosure - Deferred Revenue - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDeferredRevenueAdditionalInformationDetails Deferred Revenue - Additional Information (Details) Details 80 false false R81.htm 996177 - Disclosure - Deferred Revenue - Summary of Deferred Revenue Activity (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureDeferredRevenueSummaryOfDeferredRevenueActivityDetails Deferred Revenue - Summary of Deferred Revenue Activity (Details) Details 81 false false R82.htm 996187 - Disclosure - Leases - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureLeasesAdditionalInformationDetails Leases - Additional Information (Details) Details 82 false false R83.htm 996197 - Disclosure - Leases - Schedule of Lease Maturity, Current Guidance (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureLeasesScheduleOfLeaseMaturityCurrentGuidanceDetails Leases - Schedule of Lease Maturity, Current Guidance (Details) Details 83 false false R84.htm 996207 - Disclosure - Leases - Schedule of Right of Use Assets (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureLeasesScheduleOfRightOfUseAssetsDetails Leases - Schedule of Right of Use Assets (Details) Details 84 false false R85.htm 996217 - Disclosure - Other (Expense) Income, Net - Computation of Other (Expense) Income, Net (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureOtherExpenseIncomeNetComputationOfOtherExpenseIncomeNetDetails Other (Expense) Income, Net - Computation of Other (Expense) Income, Net (Details) Details http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureOtherExpenseIncomeNetTables 85 false false R86.htm 996237 - Disclosure - Other Current Liabilities - Summary of Other Current Liabilities (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureOtherCurrentLiabilitiesSummaryOfOtherCurrentLiabilitiesDetails Other Current Liabilities - Summary of Other Current Liabilities (Details) Details 86 false false R87.htm 996247 - Disclosure - Employee Benefit Plans - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureEmployeeBenefitPlansAdditionalInformationDetails Employee Benefit Plans - Additional Information (Details) Details 87 false false R88.htm 996257 - Disclosure - Employee Benefit Plans - Reconciliation of Changes in Benefit Obligations, Funded Status and Amounts Recognized in Consolidated Balance Sheets (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureEmployeeBenefitPlansReconciliationOfChangesInBenefitObligationsFundedStatusAndAmountsRecognizedInConsolidatedBalanceSheetsDetails Employee Benefit Plans - Reconciliation of Changes in Benefit Obligations, Funded Status and Amounts Recognized in Consolidated Balance Sheets (Details) Details 88 false false R89.htm 996267 - Disclosure - Employee Benefit Plans - Weighted-Average Actuarial Assumptions Used to Determine Benefit Obligations (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureEmployeeBenefitPlansWeightedaverageActuarialAssumptionsUsedToDetermineBenefitObligationsDetails Employee Benefit Plans - Weighted-Average Actuarial Assumptions Used to Determine Benefit Obligations (Details) Details 89 false false R90.htm 996277 - Disclosure - Employee Benefit Plans - Projected Benefit Obligation in Excess of Plan Assets and Accumulated Benefit Obligation in Excess of Plan Assets (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureEmployeeBenefitPlansProjectedBenefitObligationInExcessOfPlanAssetsAndAccumulatedBenefitObligationInExcessOfPlanAssetsDetails Employee Benefit Plans - Projected Benefit Obligation in Excess of Plan Assets and Accumulated Benefit Obligation in Excess of Plan Assets (Details) Details 90 false false R91.htm 996287 - Disclosure - Employee Benefit Plans - Employee Benefit Plans (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureEmployeeBenefitPlansEmployeeBenefitPlansDetails Employee Benefit Plans - Employee Benefit Plans (Details) Details 91 false false R92.htm 996297 - Disclosure - Employee Benefit Plans - Weighted-Average Actuarial Assumptions Used to Determine Net Periodic Benefit Cost (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureEmployeeBenefitPlansWeightedaverageActuarialAssumptionsUsedToDetermineNetPeriodicBenefitCostDetails Employee Benefit Plans - Weighted-Average Actuarial Assumptions Used to Determine Net Periodic Benefit Cost (Details) Details 92 false false R93.htm 996307 - Disclosure - Employee Benefit Plans - Fair Value of Plan Assets by Asset Category (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureEmployeeBenefitPlansFairValueOfPlanAssetsByAssetCategoryDetails Employee Benefit Plans - Fair Value of Plan Assets by Asset Category (Details) Details 93 false false R94.htm 996317 - Disclosure - Employee Benefit Plans - Plan Asset Allocation (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureEmployeeBenefitPlansPlanAssetAllocationDetails Employee Benefit Plans - Plan Asset Allocation (Details) Details 94 false false R95.htm 996327 - Disclosure - Employee Benefit Plans - Expected Cash Flows for Pension and Post-Retirement Benefit Plans (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureEmployeeBenefitPlansExpectedCashFlowsForPensionAndPostretirementBenefitPlansDetails Employee Benefit Plans - Expected Cash Flows for Pension and Post-Retirement Benefit Plans (Details) Details 95 false false R96.htm 996337 - Disclosure - Income Taxes - Income Before Income Taxes (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesIncomeBeforeIncomeTaxesDetails Income Taxes - Income Before Income Taxes (Details) Details 96 false false R97.htm 996347 - Disclosure - Income Taxes - Provision for Income Tax Expense (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesProvisionForIncomeTaxExpenseDetails Income Taxes - Provision for Income Tax Expense (Details) Details 97 false false R98.htm 996357 - Disclosure - Income Taxes - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetails Income Taxes - Additional Information (Details) Details 98 false false R99.htm 996367 - Disclosure - Income Taxes - Reconciliation of Provision for Income Tax Expense (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesReconciliationOfProvisionForIncomeTaxExpenseDetails Income Taxes - Reconciliation of Provision for Income Tax Expense (Details) Details 99 false false R100.htm 996377 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails Income Taxes - Deferred Tax Assets and Liabilities (Details) Details 100 false false R101.htm 996387 - Disclosure - Accumulated Other Comprehensive Loss - Changes in Components of Accumulated Other Comprehensive Loss (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLossChangesInComponentsOfAccumulatedOtherComprehensiveLossDetails Accumulated Other Comprehensive Loss - Changes in Components of Accumulated Other Comprehensive Loss (Details) Details 101 false false R102.htm 996397 - Disclosure - Accumulated Other Comprehensive Loss - Consolidated Statements of Comprehensive Income affected by reclassifications from AOCL (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveLossConsolidatedStatementsOfComprehensiveIncomeAffectedByReclassificationsFromAOCLDetails Accumulated Other Comprehensive Loss - Consolidated Statements of Comprehensive Income affected by reclassifications from AOCL (Details) Details 102 false false R103.htm 996417 - Disclosure - Concentration of Risk - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureConcentrationOfRiskAdditionalInformationDetails Concentration of Risk - Additional Information (Details) Details 103 false false R104.htm 996427 - Disclosure - Concentration of Risk - Customers Accounted for Greater Than Ten Percent of Net Sales (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureConcentrationOfRiskCustomersAccountedForGreaterThanTenPercentOfNetSalesDetails Concentration of Risk - Customers Accounted for Greater Than Ten Percent of Net Sales (Details) Details 104 false false R105.htm 996437 - Disclosure - Concentration of Risk - Customers Accounted for Greater Than Ten Percent of Accounts Receivable (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureConcentrationOfRiskCustomersAccountedForGreaterThanTenPercentOfAccountsReceivableDetails Concentration of Risk - Customers Accounted for Greater Than Ten Percent of Accounts Receivable (Details) Details 105 false false R106.htm 996447 - Disclosure - Common Stock - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureCommonStockAdditionalInformationDetails Common Stock - Additional Information (Details) Details 106 false false R107.htm 996457 - Disclosure - Earnings Per Share - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureEarningsPerShareAdditionalInformationDetails Earnings Per Share - Additional Information (Details) Details 107 false false R108.htm 996467 - Disclosure - Earnings Per Share - Schedule of Reconciliation of Numerators and Denominators Used to Calculate Basic EPS and Diluted EPS (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureEarningsPerShareScheduleOfReconciliationOfNumeratorsAndDenominatorsUsedToCalculateBasicEPSAndDilutedEPSDetails Earnings Per Share - Schedule of Reconciliation of Numerators and Denominators Used to Calculate Basic EPS and Diluted EPS (Details) Details 108 false false R109.htm 996477 - Disclosure - Geographic Information - Net Sales by Country (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureGeographicInformationNetSalesByCountryDetails Geographic Information - Net Sales by Country (Details) Details 109 false false R110.htm 996487 - Disclosure - Geographic Information - Net Long-Lived Assets by Country (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureGeographicInformationNetLongLivedAssetsByCountryDetails Geographic Information - Net Long-Lived Assets by Country (Details) Details 110 false false R111.htm 996497 - Disclosure - Segment Information - Additional Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails Segment Information - Additional Information (Details) Details 111 false false R112.htm 996507 - Disclosure - Segment Information - Schedule of Segment Reporting Information (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureSegmentInformationScheduleOfSegmentReportingInformationDetails Segment Information - Schedule of Segment Reporting Information (Details) Details 112 false false R113.htm 996517 - Disclosure - Schedule I-Parent Company Only Financial Statements - Balance Sheets (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureScheduleIparentCompanyOnlyFinancialStatementsBalanceSheetsDetails Schedule I-Parent Company Only Financial Statements - Balance Sheets (Details) Details http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureScheduleIParentCompanyOnlyFinancialStatementsBASISOFPRESENTATION 113 false false R114.htm 996527 - Disclosure - Schedule I-Parent Company Only Financial Statements - Comprehensive Income (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/DisclosureScheduleIparentCompanyOnlyFinancialStatementsComprehensiveIncomeDetails Schedule I-Parent Company Only Financial Statements - Comprehensive Income (Details) Details 114 false false R115.htm 996537 - Disclosure - Schedule I-Parent Company Only Financial Statements - Cash Flows (Details) Sheet http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureScheduleIParentCompanyOnlyFinancialStatementsCashFlowsDetails Schedule I-Parent Company Only Financial Statements - Cash Flows (Details) Details http://www.allisontransmission.com/20241231/taxonomy/role/Role_DisclosureScheduleIParentCompanyOnlyFinancialStatementsBASISOFPRESENTATION 115 false false All Reports Book All Reports alsn-20241231.htm alsn-20241231.xsd img106275686_0.jpg img106275686_1.jpg img106275686_2.jpg img106275686_3.jpg img106275686_4.jpg http://fasb.org/srt/2024 http://fasb.org/us-gaap/2024 http://xbrl.sec.gov/cyd/2024 http://xbrl.sec.gov/dei/2024 http://xbrl.sec.gov/ecd/2024 false false