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Investments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |  |  |
Net investment income | $ 409 | $ 942 | $ 830 | $ 1,590 |
Accrued investment income | 605 |  | 605 |  | $ 600
Gross gains on fixed income securities | 304 | 115 | 760 | 241 |
Gross loss on fixed income securities | (113) | $ (27) | (190) | $ (87) |
Limited partnership interests | 6,941 |  | 6,941 |  | 8,078
Short-term investments | 5,344 |  | 5,344 |  | 4,256
Fixed income securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Accrued investment income | 538 |  | 538 |  |
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost | (109) |  | (109) |  |
Mortgage loans |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Accrued investment income | 17 |  | 17 |  |
Agent loans, net |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Accrued investment income | $ 2 |  | $ 2 |  |
High credit quality, percentage | 86.00% |  | 86.00% |  |
Allowance | $ (5) |  | $ (5) |  |
Bank loans, net |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Accrued investment income | 5 |  | 5 |  |
EMA limited partnerships |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Limited partnership interests | 5,276 |  | 5,276 |  | 6,264
Limited partnership interests |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Limited partnership interests | 1,665 |  | 1,665 |  | 1,814
Mortgage loans |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Loan modifications | 274 |  |  |  |
Allowance | (86) |  | (86) |  | (3)
Other investments |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Limited partnership interests | 254 |  | 254 |  | 906
Other investments | EMA limited partnerships |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Limited partnership interests | 251 |  | 251 |  | 902
Other investments | Limited partnership interests |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Limited partnership interests | $ 3 |  | $ 3 |  | $ 4

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