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Investments - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Investment [Line Items] |  |  |  |  |
Gross gains on fixed income securities | $ 115,000,000 | $ 29,000,000 | $ 241,000,000 | $ 74,000,000 |
Gross loss on fixed income securities | (27,000,000) | (107,000,000) | (87,000,000) | (194,000,000) |
Net unrealized gains related to changes in valuation of fixed income securities subsequent to impairment measurement date | 185,000,000 |  | 185,000,000 |  | $ 180,000,000
Limited partnership interests | 7,818,000,000 |  | 7,818,000,000 |  | 7,505,000,000
Short-term investments | 3,740,000,000 |  | 3,740,000,000 |  | 3,027,000,000
EMA limited partnerships |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Limited partnership interests | 6,030,000,000.00 |  | 6,030,000,000.00 |  | 5,730,000,000
Carrying value | Cost-method Investments |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Cost method limited partnerships | 1,790,000,000 |  | 1,790,000,000 |  | $ 1,780,000,000
Mortgage loans, non-impaired |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Allowance for credit losses, period increase (decrease) | $ 0 | $ 0 | 0 | 0 |
Average impaired mortgage loans |  |  | $ 4,000,000 | $ 4,000,000 |

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