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Contracts Accounted for as Insurance - Scheduled Net Earned Premiums Insurance Contracts (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Financial Guarantee Insurance Product Line [Member]  
Financial Guarantee Insurance Premiums [Line Items]  
2020 (April 1 - June 30) $ 80
2020 (July 1 - September 30) 78
2020 (October 1 - December 31) 76
Subtotal 2020 234
2021 287
2022 265
2023 246
2024 229
2025-2029 914
2030-2034 641
2035-2039 376
After 2039 507
Net deferred premium revenue 3,699
Future accretion 262
Total future net earned premiums 3,961
Variable Interest Entity, Primary Beneficiary [Member]  
Financial Guarantee Insurance Premiums [Line Items]  
Net deferred premium revenue $ 46