Income Tax (Net Deferred Income Tax Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred income tax assets:
Policyholder liabilities and receivables	$ 3,022	$ 2,988
Net operating loss carryforwards	1,293	1,808
Employee benefits	1,068	737
Capital loss carryforwards	26	32
Tax credit carryforwards	1,733us-gaap_TaxCreditCarryforwardAmount	1,653us-gaap_TaxCreditCarryforwardAmount
Litigation-related and government mandated	315	232
Other	831us-gaap_DeferredTaxAssetsOther	503us-gaap_DeferredTaxAssetsOther
Total gross deferred income tax assets	8,288us-gaap_DeferredTaxAssetsGross	7,953us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance	224	357
Total net deferred income tax assets	8,064us-gaap_DeferredTaxAssetsNet	7,596us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities:
Investments, including derivatives	4,554	2,476
Intangibles	1,877	1,997
Net unrealized investment gains	7,971	4,510
DAC	5,153	5,103
Other	330us-gaap_DeferredTaxLiabilitiesOther	153us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities	19,885us-gaap_DeferredIncomeTaxLiabilities	14,239us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets and liabilities [Abstract]
Net deferred income tax asset (liability)	$ (11,821)us-gaap_DeferredTaxLiabilities	$ (6,643)us-gaap_DeferredTaxLiabilities

The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from estimated loss from litigation-related and government mandated settlements, which can only be deducted for tax purposes when actual litigation losses are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

No definition available.