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Investments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |
Net investment income | $ 421 | $ 648 |
Accrued investment income | 593 |  | $ 600
Gross gains on fixed income securities | 456 | 126 |
Gross loss on fixed income securities | (77) | $ (60) |
Limited partnership interests | 7,087 |  | 8,078
Short-term investments | 5,671 |  | 4,256
Limited partnership interests |  |  |
Schedule of Investments [Line Items] |  |  |
Net investment income | (52) |  |
Fixed income securities |  |  |
Schedule of Investments [Line Items] |  |  |
Accrued investment income | 530 |  |
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost | (394) |  |
Mortgage loans |  |  |
Schedule of Investments [Line Items] |  |  |
Accrued investment income | 15 |  |
Agent loans, net |  |  |
Schedule of Investments [Line Items] |  |  |
Accrued investment income | $ 2 |  |
High credit quality, percentage | 87.00% |  |
Allowance | $ (5) |  |
Bank loans, net |  |  |
Schedule of Investments [Line Items] |  |  |
Accrued investment income | 6 |  |
EMA limited partnerships |  |  |
Schedule of Investments [Line Items] |  |  |
Limited partnership interests | 5,370 |  | 6,264
Limited partnership interests |  |  |
Schedule of Investments [Line Items] |  |  |
Limited partnership interests | 1,717 |  | 1,814
Other investments |  |  |
Schedule of Investments [Line Items] |  |  |
Limited partnership interests | 216 |  | 906
Other investments | EMA limited partnerships |  |  |
Schedule of Investments [Line Items] |  |  |
Limited partnership interests | 212 |  | 902
Other investments | Limited partnership interests |  |  |
Schedule of Investments [Line Items] |  |  |
Limited partnership interests | $ 4 |  | $ 4

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