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Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | $ 105 | $ 319 | $ 818 | $ 597
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 86 | 216 | 355 | 758
Equity securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 6 | 114 | 322 | (148)
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 0 | 1 | 19 | (2)
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | (15) | 15 | 1 | (56)
Derivatives |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 46 | (30) | 54 | 62
Other |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | $ (18) | $ 3 | $ 67 | $ (17)

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