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Contracts Accounted for as Insurance - Expected Future Premium Collections and Earnings (Details)
$ in Millions
Mar. 31, 2023
USD ($)
Consolidated Entity Excluding Variable Interest Entities (VIE)  
Future Premiums to be Collected [Abstract]  
2023 (April 1 - June 30) $ 32
2023 (July 1 - September 30) 38
2023 (October 1 - December 31) 19
Subtotal 2023 89
2024 111
2025 96
2026 94
2027 91
2028-2032 379
2033-2037 252
2038-2042 175
After 2042 364
Total 1,651
Financial Guarantee Insurance Product Line  
Future Net Premiums to be Earned [Abstract]  
2023 (April 1 - June 30) 70
2023 (July 1 - September 30) 70
2023 (October 1 - December 31) 69
Subtotal 2023 209
2024 267
2025 251
2026 235
2027 221
2028-2032 925
2033-2037 618
2038-2042 377
After 2042 528
Total 3,631
Future accretion 307
Total future net earned premiums $ 3,938