Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015 contract	Dec. 31, 2014 contract
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Assumed recoveries under sale of credit protection	$ 0
Securities pledged in the form of margin deposits	30us-gaap_MarginDepositAssets
Derivatives, Fair Value
Total asset derivatives, Notional amount	408us-gaap_DerivativeAssetNotionalAmount	407us-gaap_DerivativeAssetNotionalAmount
Total liability derivatives, Notional amount	3,125	3,242
Total derivatives, Notional amount	3,533invest_DerivativeNotionalAmount	3,649invest_DerivativeNotionalAmount
Total asset derivatives, Number of contracts	4,156	3,929
Total liability derivatives, Number of contracts	3,244	3,331
Total derivatives, Number of contracts	7,400	7,260
Total asset derivatives, Fair value, net	83us-gaap_DerivativeAssets	92us-gaap_DerivativeAssets
Derivative liabilities net amount on balance sheet	(345)us-gaap_DerivativeLiabilities	(354)us-gaap_DerivativeLiabilities
Total derivatives, Fair value, net	(262)	(262)
Asset derivatives, Gross asset	85	92
Liability derivatives, Gross asset	0	2
Asset derivatives, Gross liability	(2)	0
Liability derivatives, Gross liability	(345)	(356)
Derivatives not designated as accounting hedging instruments
Derivatives, Fair Value
Total asset derivatives, Notional amount	324	322
Total liability derivatives, Notional amount	3,125	3,192
Total asset derivatives, Number of contracts	4,156	3,929
Total liability derivatives, Number of contracts	3,244	3,331
Total asset derivatives, Fair value, net	75	89
Derivative liabilities net amount on balance sheet	(345)	(353)
Asset derivatives, Gross asset	76	89
Liability derivatives, Gross asset	0	2
Asset derivatives, Gross liability	(1)	0
Liability derivatives, Gross liability	(345)	(355)
Foreign currency swap agreements \| Derivatives designated as accounting hedging instruments \| Other investments
Derivatives, Fair Value
Total asset derivatives, Notional amount	84	85
Total asset derivatives, Fair value, net	8	3
Asset derivatives, Gross asset	9	3
Asset derivatives, Gross liability	(1)	0
Foreign currency swap agreements \| Derivatives designated as accounting hedging instruments \| Other liabilities and accrued expenses
Derivatives, Fair Value
Total liability derivatives, Notional amount		50
Derivative liabilities net amount on balance sheet		(1)
Liability derivatives, Gross asset		0
Liability derivatives, Gross liability		(1)
Interest rate swap agreements \| Derivatives not designated as accounting hedging instruments \| Other liabilities and accrued expenses
Derivatives, Fair Value
Total liability derivatives, Notional amount	85	85
Derivative liabilities net amount on balance sheet	0	1
Liability derivatives, Gross asset	0	1
Liability derivatives, Gross liability	0	0
Other contracts \| Derivatives not designated as accounting hedging instruments \| Other assets
Derivatives, Fair Value
Total asset derivatives, Notional amount	3	3
Total asset derivatives, Fair value, net	1	1
Asset derivatives, Gross asset	1	1
Asset derivatives, Gross liability	0	0
Interest rate cap agreements \| Derivatives not designated as accounting hedging instruments \| Other investments
Derivatives, Fair Value
Total asset derivatives, Notional amount	153	163
Total asset derivatives, Fair value, net	1	2
Asset derivatives, Gross asset	1	2
Asset derivatives, Gross liability	0	0
Interest rate cap agreements \| Derivatives not designated as accounting hedging instruments \| Other liabilities and accrued expenses
Derivatives, Fair Value
Total liability derivatives, Notional amount	12	11
Derivative liabilities net amount on balance sheet	0	0
Liability derivatives, Gross asset	0	0
Liability derivatives, Gross liability	0	0
Interest rate contracts- Financial futures contracts \| Derivatives not designated as accounting hedging instruments \| Other liabilities and accrued expenses
Derivatives, Fair Value
Total liability derivatives, Notional amount	0	0
Total liability derivatives, Number of contracts	214	200
Derivative liabilities net amount on balance sheet	0	0
Liability derivatives, Gross asset	0	0
Liability derivatives, Gross liability	0	0
Financial futures contracts - Equity and index contracts \| Derivatives not designated as accounting hedging instruments \| Other assets
Derivatives, Fair Value
Total asset derivatives, Notional amount	0	0
Total asset derivatives, Number of contracts	1,086	704
Total asset derivatives, Fair value, net	1	1
Asset derivatives, Gross asset	1	1
Asset derivatives, Gross liability	0	0
Options \| Derivatives not designated as accounting hedging instruments \| Other investments
Derivatives, Fair Value
Total asset derivatives, Notional amount	0	0
Total asset derivatives, Number of contracts	3,070	3,225
Total asset derivatives, Fair value, net	69	83
Asset derivatives, Gross asset	69	83
Asset derivatives, Gross liability	0	0
Options and futures \| Derivatives not designated as accounting hedging instruments \| Other liabilities and accrued expenses
Derivatives, Fair Value
Total liability derivatives, Notional amount	0	0
Total liability derivatives, Number of contracts	3,030	3,131
Derivative liabilities net amount on balance sheet	(10)	(22)
Liability derivatives, Gross asset	0	0
Liability derivatives, Gross liability	(10)	(22)
Foreign currency forwards \| Derivatives not designated as accounting hedging instruments \| Other investments
Derivatives, Fair Value
Total asset derivatives, Notional amount	56	57
Total asset derivatives, Fair value, net	2	0
Asset derivatives, Gross asset	2	0
Asset derivatives, Gross liability	0	0
Foreign currency forwards \| Derivatives not designated as accounting hedging instruments \| Other liabilities and accrued expenses
Derivatives, Fair Value
Total liability derivatives, Notional amount	45	36
Derivative liabilities net amount on balance sheet	0	1
Liability derivatives, Gross asset	0	1
Liability derivatives, Gross liability	0	0
Guaranteed accumulation benefits \| Derivatives not designated as accounting hedging instruments \| Contractholder funds
Derivatives, Fair Value
Total liability derivatives, Notional amount	590	615
Derivative liabilities net amount on balance sheet	(31)	(32)
Liability derivatives, Gross asset	0	0
Liability derivatives, Gross liability	(31)	(32)
Guaranteed withdrawal benefits \| Derivatives not designated as accounting hedging instruments \| Contractholder funds
Derivatives, Fair Value
Total liability derivatives, Notional amount	408	425
Derivative liabilities net amount on balance sheet	(14)	(13)
Liability derivatives, Gross asset	0	0
Liability derivatives, Gross liability	(14)	(13)
Equity-indexed and forward starting options in life and annuity product contracts \| Derivatives not designated as accounting hedging instruments \| Contractholder funds
Derivatives, Fair Value
Total liability derivatives, Notional amount	1,785	1,786
Derivative liabilities net amount on balance sheet	(281)	(278)
Liability derivatives, Gross asset	0	0
Liability derivatives, Gross liability	(281)	(278)
Other embedded derivative financial instruments \| Derivatives not designated as accounting hedging instruments \| Contractholder funds
Derivatives, Fair Value
Total liability derivatives, Notional amount	85	85
Derivative liabilities net amount on balance sheet	0	0
Liability derivatives, Gross asset	0	0
Liability derivatives, Gross liability	0	0
Credit default swaps - buying protection \| Derivatives not designated as accounting hedging instruments \| Other investments
Derivatives, Fair Value
Total asset derivatives, Notional amount	32	19
Total asset derivatives, Fair value, net	(1)	0
Asset derivatives, Gross asset	0	0
Asset derivatives, Gross liability	(1)	0
Credit default swaps - buying protection \| Derivatives not designated as accounting hedging instruments \| Other liabilities and accrued expenses
Derivatives, Fair Value
Total liability derivatives, Notional amount	15	49
Derivative liabilities net amount on balance sheet	0	(1)
Liability derivatives, Gross asset	0	0
Liability derivatives, Gross liability	0	(1)
Credit default swaps - selling protection \| Derivatives not designated as accounting hedging instruments \| Other investments
Derivatives, Fair Value
Total asset derivatives, Notional amount	80	80
Total asset derivatives, Fair value, net	2	2
Asset derivatives, Gross asset	2	2
Asset derivatives, Gross liability	0	0
Credit default swaps - selling protection \| Derivatives not designated as accounting hedging instruments \| Other liabilities and accrued expenses
Derivatives, Fair Value
Total liability derivatives, Notional amount	100	100
Derivative liabilities net amount on balance sheet	(9)	(9)
Liability derivatives, Gross asset	0	0
Liability derivatives, Gross liability	$ (9)	$ (9)

Represents the potential amount of recoveries under sale of credit protection.

No definition available.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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- Definition

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

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- Definition

Nominal or face amount used to calculate payments on the derivative asset.

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-Glossary Notional Amount

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- Definition

The number of derivative instruments of a particular derivative asset or group of derivative assets held by the entity.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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-Paragraph 4B

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

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