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Investments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |  |  |  |
Net investment income | $ 832 |  | $ 880 | $ 1,662 | $ 2,470 |
Accrued investment income | 616 |  |  | 616 |  | $ 600
Limited partnership interests | 7,232 |  |  | 7,232 |  | 8,078
Short-term investments | 4,559 |  |  | 4,559 |  | 4,256
Fixed income securities |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Accrued investment income | 558 |  |  | 558 |  |
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost | (81) |  |  | (81) |  |
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 | 87.00% |  |  | 87.00% |  |
Allowance | $ (5) |  |  | $ (5) |  |
Bank loans, net |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Accrued investment income | 4 |  |  | 4 |  |
EMA limited partnerships |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Limited partnership interests | 5,464 |  |  | 5,464 |  | 6,264
Limited partnership interests |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Limited partnership interests | 1,768 |  |  | 1,768 |  | 1,814
Mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Loan modifications | 7 | $ 274 |  |  |  |
Allowance | (85) |  |  | (85) |  | (3)
Other investments |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Limited partnership interests | 287 |  |  | 287 |  | 906
Other investments | EMA limited partnerships |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Limited partnership interests | 287 |  |  | 287 |  | 902
Other investments | Limited partnership interests |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Limited partnership interests | $ 0 |  |  | $ 0 |  | $ 4

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