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Contracts Accounted for as Insurance - Expected Collections of Gross Premiums Receivable Net of Commissions on Assumed Business (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]  
Financial Guarantee Insurance Premiums [Line Items]  
2018 (January 1 – March 31) $ 38
2018 (April 1 – June 30) 31
2018 (July 1 – September 30) 22
2018 (October 1 – December 31) 18
2019 82
2020 78
2021 77
2022 70
2023-2027 289
2028-2032 193
2033-2037 106
After 2037 105
Total 1,109
Variable Interest Entity, Primary Beneficiary [Member]  
Financial Guarantee Insurance Premiums [Line Items]  
Cash collections on FG VIEs $ 12