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Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | $ 426 | $ (162)
Fixed income securities |  |
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | 183 | 374
Equity securities |  |
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | 164 | (510)
Mortgage loans |  |
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | 6 | (10)
Limited partnership interests |  |
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | 4 | (86)
Derivatives |  |
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | 11 | 78
Other |  |
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | $ 58 | $ (8)

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