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Investments (Details 6) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | $ 34 | $ 23
Realized — impairments | (52) | (4)
Realized gains (losses) on securities | (18) | 19
Fixed maturities [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | 14 | 3
Realized — impairments | (16) | (5)
Realized gains (losses) on securities | (2) | (2)
Change in unrealized | 453 | 218
Equity securities [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | 23 | 21
Realized — impairments | (41) | (2)
Realized gains (losses) on securities | (18) | 19
Change in unrealized | (23) | 6
Other [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | (3) | (1)
Realized — impairments | 5 | 3
Realized gains (losses) on securities | 2 | 2
Change in unrealized | (220) | (137)
Total Pretax [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | 34 | 23
Realized — impairments | (52) | (4)
Realized gains (losses) on securities | (18) | 19
Change in unrealized | 210 | 87
Tax Effects [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | (12) | (8)
Realized — impairments | 19 | 1
Realized gains (losses) on securities | 7 | (7)
Change in unrealized | (74) | (30)
Noncontrolling Interests [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | 0 | 0
Realized — impairments | 1 | 0
Realized gains (losses) on securities | 1 | 0
Change in unrealized | (2) | (1)
Marketable Securities [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | 22 | 15
Realized — impairments | (32) | (3)
Realized gains (losses) on securities | (10) | 12
Change in unrealized | $ 134 | $ 56

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