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Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Cash collateral placed with counterparties | $ 1 | $ 6
Noncash collateral placed with counterparties | 569 | 642
Cash collateral received from counterparties | $ 11 | $ 31

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- Definition Cash Collateral Placed With Counterparties + References No definition available. + Details
Name: | ally_CashCollateralPlacedWithCounterparties
Namespace Prefix: | ally_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Cash Collateral Received From Counterparties, Excluding Collateral Associated With Repurchase Agreements + References No definition available. + Details
Name: | ally_CashCollateralReceivedFromCounterpartiesExcludingCollateralAssociatedWithRepurchaseAgreements
Namespace Prefix: | ally_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Securities Collateral Placed With Counterparties + References No definition available. + Details
Name: | ally_SecuritiesCollateralPlacedWithCounterparties
Namespace Prefix: | ally_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration