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Fair Value of Assets and Liabilities (Level 3 Assets and Liabilities)(Footnotes to Table) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Net investment income
Sep. 30, 2013
Net investment income
Sep. 30, 2014
Net investment income
Sep. 30, 2013
Net investment income
Sep. 30, 2014
Interest credited to contractholder funds
Sep. 30, 2013
Interest credited to contractholder funds
Sep. 30, 2014
Interest credited to contractholder funds
Sep. 30, 2013
Interest credited to contractholder funds
Sep. 30, 2014
Contract benefits
Sep. 30, 2013
Contract benefits
Sep. 30, 2014
Contract benefits
Sep. 30, 2013
Contract benefits
Sep. 30, 2014
Loss on disposition of operations
Sep. 30, 2013
Realized capital gains and losses
Sep. 30, 2014
Realized capital gains and losses
Sep. 30, 2013
Realized capital gains and losses
Sep. 30, 2014
CMBS
Sep. 30, 2013
CMBS
Sep. 30, 2014
CMBS
Sep. 30, 2013
CMBS
Sep. 30, 2014
ABS
Sep. 30, 2013
ABS
Sep. 30, 2014
ABS
Sep. 30, 2013
ABS
Mar. 31, 2014
LBL
CMBS
Mar. 31, 2014
LBL
ABS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                                                            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings $ 12 $ 29 $ 26 $ 126                                                    
Total gains (losses) included in: Net income 3 5 14 33 3 3 9 12 5 15   40 (4) 10 8 56 (4) 1 8 18 0 0 0 (1) 0 0 0 (1)    
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date         3 2 6 8 5 14 5 37 4 10 8 56   (2) 5 7                    
Free-standing derivatives, assets 3 6 3 6                                                    
Free Standing Derivative Liabilities, Fair Value Disclosure 9 16 9 16                                                    
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Transfers to Held For Sale   $ 0   $ 0                                   $ 5   $ 5   $ 85   $ 85 $ 4 $ 4