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Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | $ 287 | $ 440 | $ 713 | $ 278
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 86 | 168 | 269 | 542
Equity securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 152 | 248 | 316 | (262)
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 13 | 7 | 19 | (3)
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 12 | 15 | 16 | (71)
Derivatives |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | (3) | 14 | 8 | 92
Other |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | $ 27 | $ (12) | $ 85 | $ (20)

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