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Fair Value - Gross Components of Purchases, Sales, Issuances and Settlements, net (Details) - Consolidated Entity Excluding Variable Interest Entities (VIE) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases $ 935 $ 609
Sales (109) (194)
Settlements (513) (1,320)
Purchases, (Sales), Issuances, (Settlements) 313 (905)
Purchases 0 0
Issuances (600) (641)
Sales 0 0
Settlements 205 146
Purchases, (Sales), Issuances, (Settlements), Liabilities (395) (495)
AFS securities | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases 3  
Sales   (4)
Purchases, (Sales), Issuances, (Settlements) 3 (4)
AFS securities | U.S. state, municipal and political subdivisions | Fixed Maturity Securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases 0  
Sales 0  
Settlements (20)  
Purchases, (Sales), Issuances, (Settlements) (20) 0
AFS securities | Foreign governments | Fixed Maturity Securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases   0
Sales   0
Settlements   (2)
Purchases, (Sales), Issuances, (Settlements) 0 (2)
AFS securities | Corporate | Fixed Maturity Securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases 228 95
Sales (36) (68)
Settlements (15) (63)
Purchases, (Sales), Issuances, (Settlements) 177 (36)
AFS securities | CLO | Fixed Maturity Securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases 15 24
Sales (2) (29)
Settlements (44) (41)
Purchases, (Sales), Issuances, (Settlements) (31) (46)
AFS securities | CLO | Fixed Maturity Securities | Related Party    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases, (Sales), Issuances, (Settlements)   0
AFS securities | ABS | Fixed Maturity Securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases 577 261
Sales 0 0
Settlements (414) (896)
Purchases, (Sales), Issuances, (Settlements) 163 (635)
AFS securities | ABS | Fixed Maturity Securities | Related Party    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases 5 0
Sales 0 0
Settlements (15) (4)
Purchases, (Sales), Issuances, (Settlements) (10) (4)
AFS securities | RMBS | Fixed Maturity Securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases 4 8
Settlements (2) (305)
Purchases, (Sales), Issuances, (Settlements) 2 (297)
AFS securities | CMBS | Fixed Maturity Securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases 29 40
Settlements (1) (1)
Purchases, (Sales), Issuances, (Settlements) 28 39
Trading securities | U.S. state, municipal and political subdivisions | Fixed Maturity Securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases, (Sales), Issuances, (Settlements) 0 0
Trading securities | Corporate | Fixed Maturity Securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Sales   0
Settlements   (4)
Purchases, (Sales), Issuances, (Settlements)   (4)
Trading securities | CLO | Related Party    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases 0 33
Sales (55) (26)
Settlements 0 0
Purchases, (Sales), Issuances, (Settlements) (55) 7
Trading securities | CLO | Fixed Maturity Securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases 4 4
Sales (16) (67)
Settlements 0 0
Purchases, (Sales), Issuances, (Settlements) (12) (63)
Trading securities | CLO | Fixed Maturity Securities | Related Party    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases, (Sales), Issuances, (Settlements) (55) 7
Trading securities | ABS | Fixed Maturity Securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases, (Sales), Issuances, (Settlements) 0 0
Trading securities | RMBS | Fixed Maturity Securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases 70 144
Sales 0 0
Settlements 0 0
Purchases, (Sales), Issuances, (Settlements) 70 144
Mortgage loans    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Settlements (2) (4)
Purchases, (Sales), Issuances, (Settlements) (2) (4)
Interest sensitive contract liabilities | Embedded derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases 0 0
Issuances (600) (641)
Sales 0 0
Settlements 205 146
Purchases, (Sales), Issuances, (Settlements), Liabilities $ (395) $ (495)