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Investments (Details 6) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | $ 29 | $ 13 | $ 52 | $ 33
Realized — impairments | (30) | (1) | (34) | (2)
Fixed maturities [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 7 | 9 | 10 | 22
Realized — impairments | (10) | 0 | (15) | (1)
Change in unrealized | (623) | 295 | (405) | 611
Equity securities [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 25 | 4 | 46 | 10
Realized — impairments | (23) | (1) | (25) | (1)
Change in unrealized | (21) | 30 | (15) | 43
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 | (2) | 0 | (2) | 1
Realized — impairments | 0 | 0 | 0 | 0
Change in unrealized | 0 | 0 | 0 | 0
Other [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | (1) | 0 | (2) | 0
Realized — impairments | 3 | 0 | 6 | 0
Change in unrealized | 314 | (137) | 177 | (273)
Total Pretax [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 29 | 13 | 52 | 33
Realized — impairments | (30) | (1) | (34) | (2)
Change in unrealized | (330) | 188 | (243) | 381
Tax Effects [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | (10) | (4) | (18) | (11)
Realized — impairments | 11 | 0 | 12 | 0
Change in unrealized | 115 | (66) | 85 | (134)
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) | 0 | (1)
Realized — impairments | 0 | 0 | 0 | 0
Change in unrealized | 3 | (2) | 2 | (5)
Marketable Securities [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 19 | 8 | 34 | 21
Realized — impairments | (19) | (1) | (22) | (2)
Change in unrealized | $ (212) | $ 120 | $ (156) | $ 242

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