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Contracts Accounted for as Insurance - Scheduled Net Earned Premiums Insurance Contracts (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Financial Guarantee Insurance Premiums [Line Items]    
Deferred premium revenue, net $ 3,694 $ 3,342
Financial Guarantee Insurance Product Line [Member]    
Financial Guarantee Insurance Premiums [Line Items]    
2017 (April 1 – June 30) 98  
2017 (July 1 – September 30) 93  
2017 (October 1 – December 31) 90  
2018 342  
2019 299  
2020 271  
2021 250  
2022-2026 967  
2027-2031 621  
2032-2036 367  
After 2036 295  
Deferred premium revenue, net 3,693  
Future accretion 189  
Total future net earned premiums 3,882  
Variable Interest Entity, Primary Beneficiary [Member]    
Financial Guarantee Insurance Premiums [Line Items]    
Deferred premium revenue, net $ 86