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Contracts Accounted for as Insurance - Net Earned Premiums (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items]      
Scheduled net earned premiums $ 285 $ 287 $ 322
Accelerations from refundings and terminations 29 179 59
Accretion of discount on net premiums receivable 26 24 30
Financial guaranty insurance net earned premiums 340 490 411
Specialty net earned premiums 4 4 3
Net earned premiums $ 344 494 $ 414
Financial Guarantee Insurance And Other Product Line      
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items]      
Accelerations from refundings and terminations   $ 133