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Commitments, Contingencies, and Guarantees - Interest Rate Lock Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
IRLCs UPB, Fixed Rate	$ 20,391,277	$ 25,937,777
IRLCs UPB, Variable Rate	$ 1,076,203	$ 1,239,762

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- Definition

Interest Rate Lock Commitments, Unpaid Principal Balance, Fixed Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	rkt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Interest Rate Lock Commitments, Unpaid Principal Balance, Variable Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	rkt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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