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Investments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investment [Line Items] |  |  |
Fixed income securities | $ 66,354 | $ 59,044 |
Short-term investments | 7,800 | 4,260 |
Fixed income and equity securities carrying value | 1,190 | 1,740 |
Interest income on collateral, net of fees | 3 | 5 | $ 4
Debt Securities below Investment Grade | 9,000 | 7,150 |
Fixed income and short-term investments carrying value | 141 |  |
Non-income producing fixed income securities | 80 |  |
Accrued investment income | 600 | 600 |
Mortgage loans, net | $ 4,075 | 4,817 |
Percentage of credit concentration risk of single issuer and affiliates of shareholder's equity | 10.00% |  |
Fixed income securities |  |  |
Investment [Line Items] |  |  |
Accrued investment income | $ 548 |  |
Mortgage loans on real estate |  |  |
Investment [Line Items] |  |  |
Accrued investment income | 15 |  |
Agent loans |  |  |
Investment [Line Items] |  |  |
Accrued investment income | $ 2 |  |
High credit quality, percentage | 85.00% |  |
Allowance | $ (5) |  |
Bank loans |  |  |
Investment [Line Items] |  |  |
Accrued investment income | 4 |  |
Municipal |  |  |
Investment [Line Items] |  |  |
Fixed income securities | 9,587 | 8,620 |
Mortgage loans on real estate |  |  |
Investment [Line Items] |  |  |
Mortgage loans, net | 4,075 | 4,817 |
Allowance | $ (67) | $ (3) |

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