Loans Held for Investment - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2025	Dec. 31, 2024
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Securitized debt loans held for investment at cost	$ 11,100,000,000	$ 11,400,000,000
Fair Value \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Loans 90 or more days delinquent	615,000,000	595,000,000
Loans held for investment
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Unpaid principal balance	11,292,225,000	11,659,420,000
Loans held for investment, at fair value
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Retained balance	$ 0	$ 0

Residential mortgage loans in the securitized loan portfolio that are 90 or more days past due.

No definition available.

Name:	cim_Loans90OrMoreDaysDelinquent
Namespace Prefix:	cim_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Loans On Residential Real Estate held For Investment, Principal Amount

+ References

No definition available.

+ Details

Name:	cim_LoansOnResidentialRealEstateHeldForInvestmentPrincipalAmount
Namespace Prefix:	cim_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Secured financing obligations carried at cost as of the reporting date consisting of securitizations that are collateralized by residential adjustable or fixed rate mortgage loans that have been placed in a trust and pay interest and principal to the debt holders of that securitization.

+ References

No definition available.

+ Details

Name:	cim_SecuritizedDebtLoansHeldForInvestmentAtCost
Namespace Prefix:	cim_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]

+ References

No definition available.

+ Details

Name:	cim_SecuritizedLoansHeldForInvestmentByConsolidatedVariableInterestEntitiesLineItems
Namespace Prefix:	cim_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of beneficial interest received as consideration for transferring noncash financial asset. Includes, but is not limited to, trade receivable in securitization transaction.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-4

+ Details

Name:	us-gaap_ConsiderationReceivedForBeneficialInterestObtainedForTransferringFinancialAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cim_SeasonedSubprimeResidentialMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=cim_LoansHeldForInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=cim_LoansHeldForInvestmentAtFairValueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: