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Investments - Net appreciation (decline) recognized in net income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Realized capital gains and losses by asset type |  |  |  |
Net appreciation (decline) recognized in net income | $ 336 | $ 302 | $ (154) | $ 747
Equity securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net appreciation (decline) recognized in net income | 390 | 207 | (45) | 688
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net appreciation (decline) recognized in net income | $ (54) | $ 95 | $ (109) | $ 59

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