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Financial Guarantee Insurance Contracts
 12 Months Ended
Dec. 31, 2020
Insurance [Abstract]  
Summary of Rollforward of RMBS Subrogation, by Estimation Approach
Below is the rollforward of RMBS R&W subrogation for the affected periods:
Year ended December 31,202020192018
Discounted RMBS subrogation recovery
(gross of reinsurance) at beginning of year
$1,727 $1,771 $1,834 
All other changes (1)
23 (43)(64)
Discounted RMBS subrogation recovery (gross of reinsurance) at end of year
$1,751 $1,727 $1,771 
(1)All other changes which may impact RMBS R&W subrogation recoveries include changes in actual or projected collateral performance, changes in the creditworthiness of a sponsor and the projected timing of recoveries.