CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Unrealized losses on AFS securities	$ 8	$ 15

Other Comprehensive Income (Loss), Securities with Allowance for Credit Losses, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax

No definition available.

Name:	cim_OtherComprehensiveIncomeLossSecuritieswithAllowanceforCreditLossesAvailableforSaleUnrealizedHoldingGainLossArisingDuringPeriodafterTax
Namespace Prefix:	cim_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration