Fair Value of Assets and Liabilities (Details 5) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Earnings	$ 1	$ 3	$ 9	$ 12
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	19	9	24	12
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	30	12	37	26
Realized capital gains and losses
Gains (losses) included in net income for Level 3 assets and liabilities:
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date	(2)		(2)	5
Net investment income
Gains (losses) included in net income for Level 3 assets and liabilities:
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date	3	3	11	6
Interest credited to contractholder funds
Gains (losses) included in net income for Level 3 assets and liabilities:
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date	27	5	32	5
Contract benefits
Gains (losses) included in net income for Level 3 assets and liabilities:
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date	(8)	4	(8)	8
Discontinued Operations
Gains (losses) included in net income for Level 3 assets and liabilities:
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date				(4)
Gain (Loss) on Investments [Member]
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	20	12	33	24
Contractholder funds: Derivatives embedded in life and annuity contracts
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	19	9	24	(5)
Liabilities held for sale
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0	0	0	17
Fixed income securities
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Earnings	3	3	9	6
Municipal
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Earnings	0	0	0	(1)
Corporate
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Earnings	3	3	8	8
Equity securities
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Earnings	(1)	0	0	0
ABS
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Earnings	0	0	1	0
CMBS
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Earnings	0	0	0	(1)
Assets held for sale
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Earnings	0	0	0	(1)
Free-standing derivatives, net
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Earnings	(1)	0	0	6
Other assets
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Earnings	$ 0	$ 0	$ 0	$ 1