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Contracts Accounted for as Insurance - Expected Future Premium Collections and Earnings (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Financial Guarantee Insurance Product Line  
Future Net Premiums to be Earned [Abstract]  
2022 (January 1 - March 31) $ 78
2022 (April 1 - June 30) 78
2022 (July 1 - September 30) 77
2022 (October 1 - December 31) 75
Subtotal 2022 308
2023 287
2024 265
2025 241
2026 223
2027-2031 920
2032-2036 628
2037-2041 361
After 2041 495
Total 3,728
Future accretion 268
Total future net earned premiums 3,996
Consolidated Entity Excluding Variable Interest Entities (VIE)  
Future Premiums to be Collected [Abstract]  
2022 (January 1 - March 31) 47
2022 (April 1 - June 30) 39
2022 (July 1 - September 30) 28
2022 (October 1 - December 31) 33
Subtotal 2022 147
2023 107
2024 99
2025 88
2026 83
2027-2031 354
2032-2036 249
2037-2041 165
After 2041 347
Total $ 1,639