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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, 2018
USD ($)
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]  
Financial Guarantee Insurance Premiums [Line Items]  
2018 (April 1 - June 30) $ 39
2018 (July 1 - September 30) 27
2018 (April 1 - June 30) 18
2019 86
2020 98
2021 80
2022 72
2023-2027 296
2028-2032 198
2033-2037 109
After 2037 108
Total 1,131
Variable Interest Entity, Primary Beneficiary [Member]  
Financial Guarantee Insurance Premiums [Line Items]  
Cash collections on FG VIEs $ 12