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Investments (Details 4) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | $ 81 | $ 24 | $ 215 | $ (125)
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 32 | 24 | 37 | (47)
Equity securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 19 | 11 | 125 | (79)
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 0 | 1 | 0 | 1
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 31 | (13) | 71 | 13
Derivatives |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | (8) | 2 | (23) | (7)
Other |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | $ 7 | $ (1) | $ 5 | $ (6)

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