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Contingencies (Details) $ in Millions	May 31, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Payments for refunds	$ 10
Payment of civil penalty	$ 10

X

- Definition

Loss Contingency, Payment Of Civil Penalty

+ References

No definition available.

+ Details

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Period Type:	duration

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- Definition

Loss Contingency, Payments For Refunds

+ References

No definition available.

+ Details

Name:	omf_LossContingencyPaymentsForRefunds
Namespace Prefix:	omf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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