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Contracts Accounted for as Insurance - Expected Collections of Gross Premiums Receivable Net of Commissions on Assumed Business (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Financial Guarantee Insurance Product Line [Member]  
Financial Guarantee Insurance Premiums [Line Items]  
2020 (April 1 - June 30) $ 50
2020 (July 1 - September 30) 36
2020 (October 1 - December 31) 18
2021 90
2022 92
2023 80
2024 78
2025-2029 337
2030-2034 235
2035-2039 149
After 2039 338
Total 1,503
Variable Interest Entity, Primary Beneficiary [Member]  
Financial Guarantee Insurance Premiums [Line Items]  
Cash collections on FG VIEs $ 8