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Investments (Details 4) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | $ 103 | $ 33 | $ 318 | $ (92)
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 41 | (1) | 78 | (48)
Equity securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 57 | 45 | 182 | (34)
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 1 | 0 | 1 | 1
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 21 | 12 | 92 | 25
Derivatives |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | (17) | (15) | (40) | (22)
Other |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | $ 0 | $ (8) | $ 5 | $ (14)

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