Fair Value Measurements Level 4 Fair Value by Hierarchy (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount			0
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	28,163,000,000		25,436,000,000
Marketable Securities, Fixed Maturities	791,000,000		280,000,000
Equity securities, trading	12,000,000		11,000,000
Available-for-sale Securities, Equity Securities	372,000,000		514,000,000
Short-term investments	1,952,000,000		2,162,000,000
Alternative Investments, Fair Value Disclosure	1,329,000,000		1,309,000,000
Reinsurance Recoverables	19,794,000,000		20,053,000,000
Separate Account Assets	140,874,000,000		134,689,000,000
Total assets accounted for at fair value on a recurring basis	170,114,000,000		161,030,000,000
Liabilities accounted for at fair value on a recurring basis
Total liabilities accounted for at fair value on a recurring basis			(890,000,000)
Derivative Liability, Fair Value, Amount Offset Against Collateral	71,000,000		129,000,000
Separate Account Assets, at Carrying Value	2,400,000,000		2,500,000,000
Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			165,000,000
Derivative Financial Instruments, Liabilities [Member]
Liabilities accounted for at fair value on a recurring basis
Derivative Liability, Fair Value, Amount Offset Against Collateral	120,000,000		399,000,000
Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	825,000,000	[1]	722,000,000	[2]
Credit derivative [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	9,000,000		3,000,000
Credit derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			0
Equity derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			(28,000,000)
Foreign exchange derivative [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	14,000,000		(1,000,000)
Foreign exchange derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			444,000,000
Interest rate derivatives [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(57,000,000)		123,000,000
Interest rate derivatives [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			409,000,000
Derivative Financial Instruments, Assets [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	272,000,000	[3]	339,000,000	[3]
Embedded Derivative Financial Instruments [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	2,000,000	[4]	3,000,000	[4]
ABS [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	1,129,000,000		1,171,000,000
Collateralized Debt Obligations [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	1,448,000,000		1,148,000,000
Commercial Mortgage Backed Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	2,347,000,000		1,887,000,000
Corporate [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	16,917,000,000		15,742,000,000
Foreign Government Debt Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	1,177,000,000		602,000,000
US States and Political Subdivisions Debt Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	965,000,000		1,052,000,000
Residential Mortgage Backed Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	2,431,000,000		1,857,000,000
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	287,000,000		1,400,000,000
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	1,749,000,000		1,977,000,000
Level 1 [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	1,077,000,000		72,000,000
Marketable Securities, Fixed Maturities	0		0
Equity securities, trading	12,000,000		11,000,000
Available-for-sale Securities, Equity Securities	207,000,000		411,000,000
Short-term investments	228,000,000		199,000,000
Total assets accounted for at fair value on a recurring basis	101,441,000,000		92,217,000,000
Liabilities accounted for at fair value on a recurring basis
Total liabilities accounted for at fair value on a recurring basis			0
Level 1 [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			0
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0	[1]	0	[2]
Level 1 [Member] | Credit derivative [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Level 1 [Member] | Credit derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			0
Level 1 [Member] | Equity derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			0
Level 1 [Member] | Foreign exchange derivative [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Level 1 [Member] | Foreign exchange derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			0
Level 1 [Member] | Interest rate derivatives [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Level 1 [Member] | Interest rate derivatives [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			0
Level 1 [Member] | Embedded Derivative Financial Instruments [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0	[4]	0	[4]
Level 1 [Member] | ABS [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | Collateralized Debt Obligations [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | Commercial Mortgage Backed Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | Corporate [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | Foreign Government Debt Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | Residential Mortgage Backed Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | US Treasury Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	1,077,000,000		72,000,000
Level 2 [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	24,515,000,000		23,339,000,000
Marketable Securities, Fixed Maturities	613,000,000		196,000,000
Equity securities, trading	0		0
Available-for-sale Securities, Equity Securities	114,000,000		55,000,000
Short-term investments	1,724,000,000		1,963,000,000
Total assets accounted for at fair value on a recurring basis	65,374,000,000		65,815,000,000
Liabilities accounted for at fair value on a recurring basis
Total liabilities accounted for at fair value on a recurring basis			(801,000,000)
Level 2 [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			0
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	856,000,000	[1]	801,000,000	[2]
Level 2 [Member] | Credit derivative [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	11,000,000		5,000,000
Level 2 [Member] | Credit derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			(1,000,000)
Level 2 [Member] | Equity derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			(25,000,000)
Level 2 [Member] | Foreign exchange derivative [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	14,000,000		(1,000,000)
Level 2 [Member] | Foreign exchange derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			444,000,000
Level 2 [Member] | Interest rate derivatives [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(57,000,000)		123,000,000
Level 2 [Member] | Interest rate derivatives [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			382,000,000
Level 2 [Member] | Derivative Financial Instruments, Assets [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	99,000,000	[3]	132,000,000	[3]
Level 2 [Member] | Embedded Derivative Financial Instruments [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0	[4]	0	[4]
Level 2 [Member] | ABS [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	1,021,000,000		1,089,000,000
Level 2 [Member] | Collateralized Debt Obligations [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	1,020,000,000		788,000,000
Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	1,987,000,000		1,768,000,000
Level 2 [Member] | Corporate [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	16,127,000,000		15,096,000,000
Level 2 [Member] | Foreign Government Debt Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	1,139,000,000		572,000,000
Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	916,000,000		998,000,000
Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	1,633,000,000		1,123,000,000
Level 2 [Member] | US Treasury Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	672,000,000		1,905,000,000
Level 3 [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	2,571,000,000		2,025,000,000
Marketable Securities, Fixed Maturities	178,000,000		84,000,000
Equity securities, trading	0		0
Available-for-sale Securities, Equity Securities	51,000,000		48,000,000
Short-term investments	0		0
Total assets accounted for at fair value on a recurring basis	3,299,000,000		2,998,000,000
Liabilities accounted for at fair value on a recurring basis
Total liabilities accounted for at fair value on a recurring basis			(89,000,000)
Level 3 [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			165,000,000
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(31,000,000)	[1]	(79,000,000)	[2]
Level 3 [Member] | Credit derivative [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(2,000,000)		(2,000,000)
Level 3 [Member] | Credit derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			1,000,000
Level 3 [Member] | Equity derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			(3,000,000)
Level 3 [Member] | Foreign exchange derivative [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Level 3 [Member] | Foreign exchange derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			0
Level 3 [Member] | Interest rate derivatives [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Level 3 [Member] | Interest rate derivatives [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			27,000,000
Level 3 [Member] | Derivative Financial Instruments, Assets [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	173,000,000	[3]	207,000,000	[3]
Level 3 [Member] | Embedded Derivative Financial Instruments [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	2,000,000	[4]	3,000,000	[4]
Level 3 [Member] | ABS [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	108,000,000		82,000,000
Level 3 [Member] | Collateralized Debt Obligations [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	428,000,000		360,000,000
Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	360,000,000		119,000,000
Level 3 [Member] | Corporate [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	790,000,000		646,000,000
Level 3 [Member] | Foreign Government Debt Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	38,000,000		30,000,000
Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	49,000,000		54,000,000
Level 3 [Member] | Residential Mortgage Backed Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	798,000,000		734,000,000
Level 3 [Member] | US Treasury Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	0		0
Fair Value, Measurements, Recurring [Member]
Liabilities accounted for at fair value on a recurring basis
Total liabilities accounted for at fair value on a recurring basis	(1,421,000,000)
Fair Value, Measurements, Recurring [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	594,000,000
Fair Value, Measurements, Recurring [Member] | Credit derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(11,000,000)
Fair Value, Measurements, Recurring [Member] | Equity derivative [Member]
Assets accounted for at fair value on a recurring basis
Derivative Asset			2,000,000
Fair Value, Measurements, Recurring [Member] | Equity derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(18,000,000)
Fair Value, Measurements, Recurring [Member] | Foreign exchange derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	382,000,000
Fair Value, Measurements, Recurring [Member] | Interest rate derivatives [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	319,000,000
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Liabilities accounted for at fair value on a recurring basis
Total liabilities accounted for at fair value on a recurring basis	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Credit derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity derivative [Member]
Assets accounted for at fair value on a recurring basis
Derivative Asset			0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign exchange derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest rate derivatives [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Liabilities accounted for at fair value on a recurring basis
Total liabilities accounted for at fair value on a recurring basis	(856,000,000)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Credit derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(7,000,000)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity derivative [Member]
Assets accounted for at fair value on a recurring basis
Derivative Asset			0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(16,000,000)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign exchange derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	382,000,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest rate derivatives [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	295,000,000
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Liabilities accounted for at fair value on a recurring basis
Total liabilities accounted for at fair value on a recurring basis	(565,000,000)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	594,000,000
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Credit derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(4,000,000)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity derivative [Member]
Assets accounted for at fair value on a recurring basis
Derivative Asset			2,000,000
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(2,000,000)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Foreign exchange derivative [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest rate derivatives [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	24,000,000
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	360,000,000		119,000,000
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Residential Mortgage Backed Securities [Member]
Assets accounted for at fair value on a recurring basis
Available-for-sale Securities, Debt Securities	798,000,000		734,000,000
Limited Partnerships and Other Alternative Investments [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	The predominant valuation method uses a NAV calculated on a monthly basis and represents funds where the Company does not have the ability to redeem the investment in the near-term at that NAV, including an assessment of the investee's liquidity.
Derivative Financial Instruments, Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Techniques			Derivative instruments are fair valued using pricing valuation models for OTC derivatives that utilize independent market data inputs, quoted market prices for exchange-traded and OTC-cleared derivatives, or independent broker quotations. Excluding embedded and reinsurance related derivatives, as of December 31, 2014 and 2013, 95% and 97%, respectively, of derivatives, based upon notional values, were priced by valuation models or quoted market prices. The remaining derivatives were priced by broker quotations.
UNITED STATES | Guaranteed Minimum Withdrawal Benefit [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			139,000,000
UNITED STATES | Level 1 [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			0
UNITED STATES | Level 2 [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			0
UNITED STATES | Level 3 [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			139,000,000
UNITED STATES | Fair Value, Measurements, Recurring [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	576,000,000
UNITED STATES | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0
UNITED STATES | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0
UNITED STATES | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	576,000,000
GMWB Reinsurance [Member]
Assets accounted for at fair value on a recurring basis
Reinsurance Recoverables	(465,000,000)		56,000,000
GMWB Reinsurance [Member] | Level 1 [Member]
Assets accounted for at fair value on a recurring basis
Reinsurance Recoverables	0		0
GMWB Reinsurance [Member] | Level 2 [Member]
Assets accounted for at fair value on a recurring basis
Reinsurance Recoverables	0		0
GMWB Reinsurance [Member] | Level 3 [Member]
Assets accounted for at fair value on a recurring basis
Reinsurance Recoverables	(465,000,000)		56,000,000
Equity Linked Notes [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			26,000,000
Equity Linked Notes [Member] | Level 1 [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			0
Equity Linked Notes [Member] | Level 2 [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			0
Equity Linked Notes [Member] | Level 3 [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net			26,000,000
Equity Linked Notes [Member] | Fair Value, Measurements, Recurring [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	18,000,000
Equity Linked Notes [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0
Equity Linked Notes [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0
Equity Linked Notes [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other policyholder funds and benefits payable [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	18,000,000
US GMWB Hedging Instruments [Member] | UNITED STATES | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	26,000,000		119,000,000
US GMWB Hedging Instruments [Member] | UNITED STATES | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(15,000,000)		(55,000,000)
US GMWB Hedging Instruments [Member] | UNITED STATES | Level 1 [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0		0
US GMWB Hedging Instruments [Member] | UNITED STATES | Level 1 [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0		0
US GMWB Hedging Instruments [Member] | UNITED STATES | Level 2 [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(42,000,000)		5,000,000
US GMWB Hedging Instruments [Member] | UNITED STATES | Level 2 [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	63,000,000		1,000,000
US GMWB Hedging Instruments [Member] | UNITED STATES | Level 3 [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	68,000,000		114,000,000
US GMWB Hedging Instruments [Member] | UNITED STATES | Level 3 [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(78,000,000)		(56,000,000)
International Program Hedging Instruments [Member] | JAPAN | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	171,000,000
International Program Hedging Instruments [Member] | JAPAN | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	198,000,000
International Program Hedging Instruments [Member] | JAPAN | Level 1 [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0
International Program Hedging Instruments [Member] | JAPAN | Level 1 [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0
International Program Hedging Instruments [Member] | JAPAN | Level 2 [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	173,000,000
International Program Hedging Instruments [Member] | JAPAN | Level 2 [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	139,000,000
International Program Hedging Instruments [Member] | JAPAN | Level 3 [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	(2,000,000)
International Program Hedging Instruments [Member] | JAPAN | Level 3 [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	59,000,000
Limited Partnerships and Other Alternative Investments [Member]
Assets accounted for at fair value on a recurring basis
Alternative Investments, Fair Value Disclosure	468,000,000	[5]
Limited Partnerships and Other Alternative Investments [Member] | Level 1 [Member]
Assets accounted for at fair value on a recurring basis
Alternative Investments, Fair Value Disclosure	0	[5]
Limited Partnerships and Other Alternative Investments [Member] | Level 2 [Member]
Assets accounted for at fair value on a recurring basis
Alternative Investments, Fair Value Disclosure	414,000,000	[5]
Limited Partnerships and Other Alternative Investments [Member] | Level 3 [Member]
Assets accounted for at fair value on a recurring basis
Alternative Investments, Fair Value Disclosure	54,000,000	[5]
Macro Hedge Program [Member] | UNITED STATES | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	109,000,000		93,000,000
Macro Hedge Program [Member] | UNITED STATES | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	30,000,000		48,000,000
Macro Hedge Program [Member] | UNITED STATES | Level 1 [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Macro Hedge Program [Member] | UNITED STATES | Level 1 [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Macro Hedge Program [Member] | UNITED STATES | Level 2 [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Macro Hedge Program [Member] | UNITED STATES | Level 2 [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Macro Hedge Program [Member] | UNITED STATES | Level 3 [Member] | Other Investments [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	109,000,000		93,000,000
Macro Hedge Program [Member] | UNITED STATES | Level 3 [Member] | Other liabilities [Member]
Assets accounted for at fair value on a recurring basis
Derivative Assets (Liabilities), at Fair Value, Net	30,000,000		48,000,000
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]
Assets accounted for at fair value on a recurring basis
Reinsurance Recoverables	67,000,000		34,000,000
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 1 [Member]
Assets accounted for at fair value on a recurring basis
Reinsurance Recoverables	0		0
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 2 [Member]
Assets accounted for at fair value on a recurring basis
Reinsurance Recoverables	67,000,000		34,000,000
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 3 [Member]
Assets accounted for at fair value on a recurring basis
Reinsurance Recoverables	0		0
Separate Accounts [Member]
Assets accounted for at fair value on a recurring basis
Separate Account Assets	138,482,000,000	[1]	132,198,000,000	[1]
Separate Accounts [Member] | Level 1 [Member]
Assets accounted for at fair value on a recurring basis
Separate Account Assets	99,917,000,000	[1]	91,524,000,000	[1]
Separate Accounts [Member] | Level 2 [Member]
Assets accounted for at fair value on a recurring basis
Separate Account Assets	37,828,000,000	[1]	40,096,000,000	[1]
Separate Accounts [Member] | Level 3 [Member]
Assets accounted for at fair value on a recurring basis
Separate Account Assets	737,000,000	[1]	578,000,000	[1]

[1] As of December 31, 2014 and 2013, excludes approximately $2.5 billion and $2.4 billion, respectively, of investment sales receivable because they are trade receivables in the ordinary course of business where the carrying amount approximates fair value.[4]

[2] Includes OTC and OTC-cleared derivative instruments in a net negative market value position (derivative liability). In the Level 3 roll forward table included below in this Note, the sum of the derivative asset and liability positions are referred to as “freestanding derivatives” and are presented on a net basis.

[3] Includes OTC and OTC-cleared derivative instruments in a net asset value position after consideration of the impact of collateral posting requirements, which may be imposed by agreements, clearinghouse rules, and applicable law. At December 31, 2014 and December 31, 2013, $399 and $120, respectively, was netted against the derivative asset value in the Consolidated Balance Sheet and is excluded from the table above. For further information on derivative liabilities, see footnote 4 below.

[4] Represents embedded derivatives associated with non-funding agreement-backed consumer equity-linked notes.

[5] Represents hedge funds where equity method of accounting has been applied to a fund of funds measured at fair value