Investments (Net Inv Inc summary) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Investment income on fixed maturities	$ 354us-gaap_InvestmentIncomeInterest	$ 374us-gaap_InvestmentIncomeInterest
Net realized gains (losses)	10amp_NetRealizedInvestmentGainsLosses	5amp_NetRealizedInvestmentGainsLosses
Affordable housing partnerships	(8)	(6)
Other	23amp_InvestmentIncomeOther	24amp_InvestmentIncomeOther
Consolidated investment entities	105	74
Total net investment income	$ 484amp_NetIncomeFromInvestment	$ 471amp_NetIncomeFromInvestment

Represents the equity method losses related to investments in affordable housing partnerships.

No definition available.

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- Definition

Represents the income from investments in consolidated investment entities.

+ References

No definition available.

+ Details

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- Definition

Represents the income from investments not otherwise specified in financial statements.

+ References

No definition available.

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- Definition

Interest income on fixed maturity securities classified as Available-for-Sale, commercial mortgage loans, policy loans, consumer loans, other investments and cash and cash equivalents; the changes in fair value of trading securities, including seed money, certain derivatives, and assets and liabilities of consolidated investment entities; the pro rata share of net income or loss on equity method investments; and realized gains and losses on the sale of securities and charges for investments determined to be other-than-temporarily impaired.

+ References

No definition available.

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- Definition

The net realized gains or losses on investments during the period.

+ References

No definition available.

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- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7(b))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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