Annual report pursuant to Section 13 and 15(d)

AVAILABLE-FOR-SALE AND OTHER SECURITIES - Collateralized Debt Obligation Securities (Details)

v3.8.0.1
AVAILABLE-FOR-SALE AND OTHER SECURITIES - Collateralized Debt Obligation Securities (Details)
$ in Millions
Dec. 31, 2017
USD ($)
issuer
Dec. 31, 2016
USD ($)
Schedule of Available-for-sale Securities [Line Items]    
Unrealized Loss | $ $ (286) $ (262)
Collateralized Debt Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Par Value | $ 35 137
Amortized Cost | $ 35 101
Fair Value | $ 24 76
Unrealized Loss | $ $ (11) $ (25)
Collateralized Debt Obligations | Alesco II    
Schedule of Available-for-sale Securities [Line Items]    
Number of Issuers Currently Performing 30  
Number of Issuers Currently Remaining 32  
Collateralized Debt Obligations | ICONS    
Schedule of Available-for-sale Securities [Line Items]    
Number of Issuers Currently Performing 19  
Number of Issuers Currently Remaining 21  
Collateralized Debt Obligations | MM Comm III    
Schedule of Available-for-sale Securities [Line Items]    
Par Value | $ $ 4  
Amortized Cost | $ 4  
Fair Value | $ 4  
Unrealized Loss | $ $ 0  
Number of Issuers Currently Performing 5  
Number of Issuers Currently Remaining 8  
Collateralized Debt Obligations | Pre TSL IX    
Schedule of Available-for-sale Securities [Line Items]    
Number of Issuers Currently Performing 27  
Number of Issuers Currently Remaining 38  
Collateralized Debt Obligations | Pre TSL XI    
Schedule of Available-for-sale Securities [Line Items]    
Number of Issuers Currently Performing 42  
Number of Issuers Currently Remaining 55  
Collateralized Debt Obligations | Pre TSL XIII    
Schedule of Available-for-sale Securities [Line Items]    
Number of Issuers Currently Performing 47  
Number of Issuers Currently Remaining 56  
Collateralized Debt Obligations | Reg Diversified    
Schedule of Available-for-sale Securities [Line Items]    
Number of Issuers Currently Performing 23  
Number of Issuers Currently Remaining 39  
Collateralized Debt Obligations | Soloso    
Schedule of Available-for-sale Securities [Line Items]    
Number of Issuers Currently Performing 30  
Number of Issuers Currently Remaining 40  
Collateralized Debt Obligations | Tropic III [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Par Value | $ $ 31  
Amortized Cost | $ 31  
Fair Value | $ 20  
Unrealized Loss | $ $ (11)