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Investments (Details 6) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | $ 20 |  | $ 57 |
Realized — impairments | (1) |  | 0 |
Fixed maturities [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 13 |  | 19 |
Realized — impairments | (1) |  | 0 |
Change in unrealized | 316 |  | (15) |
Equity securities [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 6 |  | 38 |
Realized — impairments | 0 |  | 0 |
Change in unrealized | 13 |  | 67 |
Mortgage Loans and Other Investments [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 1 |  | 1 |
Realized — impairments | 0 |  | 0 |
Change in unrealized | 0 |  | 0 |
Other [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 0 | [1] | (1) | [1]
Realized — impairments | 0 | [1] | 0 | [1]
Change in unrealized | (136) | [1] | 14 | [1]
Tax Effects [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | (7) |  | (20) |
Realized — impairments | 0 |  | 0 |
Change in unrealized | (68) |  | (23) |
Noncontrolling Interests [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 0 |  | (1) |
Realized — impairments | 0 |  | 0 |
Change in unrealized | (3) |  | (1) |
Marketable Securities [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 13 |  | 36 |
Realized — impairments | (1) |  | 0 |
Change in unrealized | $ 122 |  | $ 42 |
[1] | Primarily adjustments to deferred policy acquisition costs and reserves related to annuities and long-term care business.

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- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. + References No definition available. + Details
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- Definition The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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