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Contracts Accounted for as Insurance - Scheduled Net Earned Premiums Insurance Contracts (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Financial Guarantee Insurance Product Line [Member]  
Financial Guarantee Insurance Premiums [Line Items]  
2019 (April 1 - June 30) $ 85
2019 (July 1 - September 30) 83
2019 (October 1 - December 31) 80
Subtotal 2019 248
2020 304
2021 276
2022 251
2023 230
2024-2028 903
2029-2033 609
2034-2038 341
After 2038 286
Deferred premium revenue, net 3,448
Future accretion 181
Total future net earned premiums 3,629
Variable Interest Entity, Primary Beneficiary [Member]  
Financial Guarantee Insurance Premiums [Line Items]  
Deferred premium revenue, net $ 63