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Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | $ (733) | $ 287 | $ (1,000) | $ 713
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | (326) | 86 | (478) | 269
Equity securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | (636) | 152 | (983) | 316
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | 0 | 13 | (1) | 19
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | (74) | 12 | (175) | 16
Derivatives |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | 272 | (3) | 590 | 8
Other investments |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net gains (losses) on investments and derivatives | $ 31 | $ 27 | $ 47 | $ 85

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