Income Taxes Level 4 Deferred tax assets (liabilities) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Valuation Allowance, Commentary	The Company has recorded a deferred tax asset valuation allowance that is adequate to reduce the total deferred tax asset to an amount that will more likely than not be realized. In assessing the need for a valuation allowance, management considered future taxable temporary difference reversals, future taxable income exclusive of reversing temporary differences and carryovers, taxable income in open carry back years and other tax planning strategies. From time to time, tax planning strategies could include holding a portion of debt securities with market value losses until recovery, altering the level of tax exempt securities held, making investments which have specific tax characteristics, and business considerations such as asset-liability matching. Management views such tax planning strategies as prudent and feasible and would implement them, if necessary, to realize the deferred tax assets.
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Loss Reserves	$ 573,000,000	$ 632,000,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Policyholder Liabilities	163,000,000	207,000,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve	456,000,000	434,000,000
Deferred Tax Assets, Investments	1,020,000,000us-gaap_DeferredTaxAssetsInvestments	1,641,000,000us-gaap_DeferredTaxAssetsInvestments
Deferred Tax Assets, Derivative Instruments	44,000,000	13,000,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	677,000,000	523,000,000
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	652,000,000	823,000,000
Deferred Tax Assets, Operating Loss Carryforwards	1,936,000,000	1,093,000,000
Deferred Tax Assets, Capital Loss Carryforwards	491,000,000	0
Deferred Tax Assets, Other	0us-gaap_DeferredTaxAssetsOther	63,000,000us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross	5,871,000,000us-gaap_DeferredTaxAssetsGross	5,592,000,000us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance	181,000,000	4,000,000
Deferred Tax Assets, Net of Valuation Allowance	5,690,000,000us-gaap_DeferredTaxAssetsNet	5,588,000,000us-gaap_DeferredTaxAssetsNet
Tax Credit Carryforward, Valuation Allowance	9
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	5,547,000,000
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	178,000,000	163,000,000
Operating Loss Carryforwards		3,123,000,000us-gaap_OperatingLossCarryforwards
Components of Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost	1,040,000,000	894,000,000
Tax Basis of Investments, Unrealized Appreciation (Depreciation), Net	(1,489,000,000)	(669,000,000)
Deferred Tax Liabilities, Deferred Expense	217,000,000	185,000,000
Deferred Tax Liabilities, Other	47,000,000us-gaap_DeferredTaxLiabilitiesOther	0us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities, Gross	2,793,000,000us-gaap_DeferredIncomeTaxLiabilities	1,748,000,000us-gaap_DeferredIncomeTaxLiabilities
Operating Loss Carryforwards, Valuation Allowance	172,000,000
Deferred Tax Assets, Net	2,897,000,000us-gaap_DeferredTaxAssetsLiabilitiesNet	3,840,000,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Before Tax [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Tax Credit Carryforward, Deferred Tax Asset	178,000,000	163,000,000
Deferred Tax Assets, Capital Loss Carryforwards	172,000,000	0
Other Liabilities [Member] \| JAPAN
Components of Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities, Net	0	61,000,000
UNITED STATES \| Before Tax [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	5,508,000,000	3,123,000,000
Foreign [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	39,000,000	0
Earliest Tax Year [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2018
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2016
Expiring within Tax Years 2016 to 2017 [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	3,000,000
Latest Tax Year [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2024
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2033
Expiring within Tax Years 2018 to 2024 [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	178,000,000
Expiring within Tax Years 2023 to 2033 [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	5,544,000,000
Expiring Tax Year 2019 [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Capital Loss Carryforwards	491,000,000
No expiration tax year [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	$ 0

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Amount of deferred tax asset, before valuation allowance, attributable to deductible other tax carryforwards.

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Valuation Allowance

-URI http://asc.fasb.org/extlink&oid=6528051

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