Reinsurance Reinsurance (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Premiums Earned [Abstract]
Assumed Premiums Earned, Life		$ 33
Ceded Premiums Earned, Life		(392)
Premiums Receivable, Allowance for Doubtful Accounts	(245)		(244)
Reinsurance Recoverables	23,139		23,330
Reinsurance Recoverables on Unpaid Losses, Gross	2,862		2,841
Life Insurance Fees Earned Premiums and Other [Abstract]
Gross Fee Income Earned Premium and Other Life		1,703
Assumed Premiums Earned, Life		33
Ceded Premiums Earned, Life		(392)
Net Fee Income Earned Premium and Other Life		1,344
Reinsurance Recoverables on Paid Losses	115		138
Life Annuity Accident and Health Insurance Product [Domain]
Premiums Earned [Abstract]
Reinsurance Recoverables	20,407		20,595
Life and Annuity Insurance Product Line [Member]
Premiums Earned [Abstract]
Assumed Premiums Earned, Life	48
Ceded Premiums Earned, Life	(438)
Life Insurance Fees Earned Premiums and Other [Abstract]
Gross Fee Income Earned Premium and Other Life	1,666
Assumed Premiums Earned, Life	48
Ceded Premiums Earned, Life	(438)
Net Fee Income Earned Premium and Other Life	1,276
Property, Liability and Casualty Insurance Product Line [Member]
Premiums Earned [Abstract]
Direct Premiums Earned, Property and Casualty	2,606	2,573
Assumed Premiums Earned, Life	65	60
Ceded Premiums Earned, Life	(202)	(208)
Premiums Earned, Net, Property and Casualty	2,469	2,425
Premiums Written, Net, Property and Casualty	2,598	2,523
Reinsurance Recoverables, Gross	2,977		2,979
Reinsurance Recoverables	2,732		2,735
Assumed Premiums Written, Property and Casualty	69	62
Ceded Premiums Written, Property and Casualty	(189)	(335)
Direct Premiums Written, Property and Casualty	2,718	2,796
Life Insurance Fees Earned Premiums and Other [Abstract]
Assumed Premiums Earned, Life	65	60
Ceded Premiums Earned, Life	(202)	(208)
Life Annuity Accident and Health Insurance Product line [Domain]
Premiums Earned [Abstract]
Reinsurance Recoverables	1,261		1,221
Retirement Plans and Individual Life Businesses [Member] \| Life Annuity Accident and Health Insurance Product line [Domain]
Premiums Earned [Abstract]
Reinsurance Recoverables	$ 19,146		$ 19,374

Gross fee income earned premium and other life.

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Net fee income earned premium and other life.

+ References

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Amount of earned premiums assumed from other entities.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12

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Amount of written premiums assumed from other entities.

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Amount of earned premiums ceded to other entities.

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Amount of written premiums ceded to other entities.

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Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 235

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Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written.

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of property and casualty premiums earned.

+ References

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-Publisher FASB

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The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value.

+ References

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-Publisher FASB

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written.

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Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

+ References

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

-Publisher SEC

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-Number 210

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Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

+ References

No definition available.

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Amount after valuation allowance of reinsurance recoverables on paid losses.

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-Publisher FASB

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-Topic 944

-SubTopic 310

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Amount before valuation allowance of reinsurance recoverables for losses reported to the ceding insurer but not yet paid, and for amounts expected based upon statistical projections and other measures of incurred losses and loss settlement expenses which have not yet been reported to the ceding insurer.

+ References

No definition available.

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