Fair Value of Assets and Liabilities (Details 5) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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	$ (2)	$ 10	$ (3)
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings	19	9	109
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date, included in earnings	17	19	106
Realized capital gains and losses
Gains (losses) included in net income for Level 3 assets and liabilities:
Gains (losses) for Level 3 assets still held at the balance sheet date	(20)	(3)	(9)
Net investment income
Gains (losses) included in net income for Level 3 assets and liabilities:
Gains (losses) for Level 3 assets still held at the balance sheet date	18	12	12
Interest credited to contractholder funds
Gains (losses) included in net income for Level 3 assets and liabilities:
Gains (losses) for Level 3 assets still held at the balance sheet date	26	(5)	35
Life and annuity contract benefits
Gains (losses) included in net income for Level 3 assets and liabilities:
Gains (losses) for Level 3 assets still held at the balance sheet date	(7)	15	74
Loss on disposition of operations
Gains (losses) included in net income for Level 3 assets and liabilities:
Gains (losses) for Level 3 assets still held at the balance sheet date			(6)
Contractholder funds: Derivatives embedded in life and annuity contracts
Gains (losses) included in net income for Level 3 assets and liabilities:
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings	19	(8)	89
Liabilities held for sale
Gains (losses) included in net income for Level 3 assets and liabilities:
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings	0	17	20
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	1	4	(10)
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	(12)	(7)	(19)
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	11	11	13
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	2	1	(1)
RMBS
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	(1)	(1)
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	(2)
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	(4)	0	0
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	5	10
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	1	(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	$ (2)