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Investments (Details 6) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | $ 19 | $ 24 | $ 71 | $ 57
Realized — impairments | (35) | (11) | (69) | (13)
Fixed maturities [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 7 | 10 | 17 | 32
Realized — impairments | (17) | (9) | (32) | (10)
Change in unrealized | (9) | (145) | (414) | 466
Equity securities [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 13 | 16 | 59 | 26
Realized — impairments | (23) | (5) | (48) | (6)
Change in unrealized | (135) | (40) | (150) | 3
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 | 0 | (1) | (2) | 0
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) | (1) | (3) | (1)
Realized — impairments | 5 | 3 | 11 | 3
Change in unrealized | (11) | 60 | 166 | (213)
Total Pretax [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 19 | 24 | 71 | 57
Realized — impairments | (35) | (11) | (69) | (13)
Change in unrealized | (155) | (125) | (398) | 256
Tax Effects [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | (7) | (10) | (25) | (21)
Realized — impairments | 13 | 5 | 25 | 5
Change in unrealized | 55 | 44 | 140 | (90)
Noncontrolling Interests [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | (1) | 0 | (1) | (1)
Realized — impairments | 1 | 0 | 1 | 0
Change in unrealized | 2 | 2 | 4 | (3)
Marketable Securities [Member] |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 11 | 14 | 45 | 35
Realized — impairments | (21) | (6) | (43) | (8)
Change in unrealized | $ (98) | $ (79) | $ (254) | $ 163

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