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			6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	$ 13	$ (2)		$ 7	$ 14
Total gains (losses) included in: Net income	4	10		2	11
Free-standing derivatives, assets		3			3
Free Standing Derivative Liabilities, Fair Value Disclosure	9	8		9	8
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Transfers to Held For Sale		347			347
CMBS
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total gains (losses) included in: Net income		0		0	0
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Transfers to Held For Sale		0	$ (4)		(4)
ABS
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total gains (losses) included in: Net income	(1)	0		(1)	0
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Transfers to Held For Sale		0			0
Assets held for sale
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total gains (losses) included in: Net income		0			(1)
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Transfers to Held For Sale		347	$ 4		351
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	4		6	6
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date	3	4		6	6
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	9	(10)		5
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date	9	(10)		5
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		(1)			4
Discontinued Operations
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					(4)
Loss on disposition of operations
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		2
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	1	5		(4)	8
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date		$ 4		(1)	$ 5
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Free-standing derivatives, assets	2			2		$ 2
Free Standing Derivative Liabilities, Fair Value Disclosure	$ 9			$ 9		$ 9