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Investments - Mortgage loans (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investment [Line Items] |  |  |  |
Realized capital gains (losses) | $ 4 | $ 1,356 | $ 1,885 | $ (877)
Mortgage loans |  |  |  |
Investment [Line Items] |  |  |  |
Payments to acquire investments | 234 |  |  |
Reduction of allowance related to sales | $ 17 |  |  |

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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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