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Sales of Receivables - Summary of MARPA Activity (Details) - USD ($) $ in Millions | 12 Months Ended
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Oct. 03, 2025 | Sep. 27, 2024
Transfer Of Financial Assets Accounted For As Sales [Roll Forward] |  |
Beginning balance: | $ 177 | $ 0
Sales of receivables | 3,807 | 1,574
Cash collections | (3,804) | (1,397)
Outstanding balance sold to Purchaser | 180 | 177
Cash collected, not remitted to Purchaser | (49) | (39)
Remaining sold receivables | 131 | 138
Payments for (proceeds from) transfer of financial assets accounted for as sales | $ 3 | $ 177

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- Definition Payments For (Proceeds From) Transfer Of Financial Assets Accounted For As Sales + References No definition available. + Details
Name: | amtm_PaymentsForProceedsFromTransferOfFinancialAssetsAccountedForAsSales
Namespace Prefix: | amtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Transfer Of Financial Assets Accounted For As Sales, Receivables Sold During Period + References No definition available. + Details
Name: | amtm_TransferOfFinancialAssetsAccountedForAsSalesReceivablesSoldDuringPeriod
Namespace Prefix: | amtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Transfer Of Financial Assets Accounted For As Sales, Receivables Sold, Outstanding + References No definition available. + Details
Name: | amtm_TransferOfFinancialAssetsAccountedForAsSalesReceivablesSoldOutstanding
Namespace Prefix: | amtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Transfer Of Financial Assets Accounted For As Sales, Receivables Sold, Outstanding, Net Of Cash Collected, And Not Remitted + References No definition available. + Details
Name: | amtm_TransferOfFinancialAssetsAccountedForAsSalesReceivablesSoldOutstandingNetOfCashCollectedAndNotRemitted
Namespace Prefix: | amtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Transfer Of Financial Assets Accounted For As Sales + References No definition available. + Details
Name: | amtm_TransferOfFinancialAssetsAccountedForAsSalesRollForward
Namespace Prefix: | amtm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Transfers Of Financial Assets Accounted For As Sales, Cash Collected + References No definition available. + Details
Name: | amtm_TransfersOfFinancialAssetsAccountedForAsSalesCashCollected
Namespace Prefix: | amtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Transfers Of Financial Assets Accounted For As Sales, Cash Collected Not Remitted To Purchaser + References No definition available. + Details
Name: | amtm_TransfersOfFinancialAssetsAccountedForAsSalesCashCollectedNotRemittedToPurchaser
Namespace Prefix: | amtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant