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	$ 1,577	$ 1,823
Net operating loss carryforwards	29	64
Employee benefits	1,015	649
Capital loss carryforwards	0	14
Tax credit carryforwards	979us-gaap_TaxCreditCarryforwardAmount	909us-gaap_TaxCreditCarryforwardAmount
Litigation-related and government mandated	259	223
Other	309us-gaap_DeferredTaxAssetsOther	349us-gaap_DeferredTaxAssetsOther
Total gross deferred income tax assets	4,168us-gaap_DeferredTaxAssetsGross	4,031us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance	22	72
Total net deferred income tax assets	4,146us-gaap_DeferredTaxAssetsNet	3,959us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities:
Investments, including derivatives	2,402	2,021
Intangibles	72	77
DAC	1,568	1,600
Net unrealized investment gains	3,903	2,019
Other	36us-gaap_DeferredTaxLiabilitiesOther	27us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities	7,981us-gaap_DeferredIncomeTaxLiabilities	5,744us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets and liabilities [Abstract]
Net deferred income tax asset (liability)	$ (3,835)us-gaap_DeferredTaxLiabilities	$ (1,785)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.