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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Level 3 Assets and Liabilities)(Footnotes to Table) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value, assets and liabilities gain (loss) included in earnings $ (16) $ (6)  
Total gains (losses) included in: Net income (1) (2)  
Free-standing derivatives, assets   2  
Free-standing derivatives, liabilities 9 9  
CMBS      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total gains (losses) included in: Net income   0  
ABS      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total gains (losses) included in: Net income   0  
Net investment income      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total gains (losses) included in: Net income 3 3  
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date 3 3  
Interest credited to contractholder funds      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total gains (losses) included in: Net income 1 (4)  
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date 1 (4)  
Contract benefits      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date (16)    
Realized capital gains and losses      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total gains (losses) included in: Net income (4) (5)  
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date (18) $ (1)  
Significant unobservable inputs (Level 3) | Recurring basis      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Free-standing derivatives, assets 1   $ 1
Free-standing derivatives, liabilities $ 9   $ 8