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Investments - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Investment [Line Items] |  |  |
Gross gains on fixed income securities | $ 126,000,000 |  |
Gross loss on fixed income securities | 60,000,000 |  |
Gross gains on fixed income and equity securities |  | $ 45,000,000 |
Gross loss on fixed income and equity securities |  | (87,000,000) |
Net unrealized gains related to changes in valuation of fixed income securities subsequent to impairment measurement date | 178,000,000 |  | $ 180,000,000
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost | (231,000,000) |  |
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost | (33,000,000) |  |
Limited partnership interests | 7,493,000,000 |  | 7,505,000,000
Short-term investments | 4,157,000,000 |  | 3,027,000,000
Fixed income and equity securities |  |  |
Investment [Line Items] |  |  |
Unrealized losses | (264,000,000) |  |
Investment grade fixed income securities |  |  |
Investment [Line Items] |  |  |
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost | (179,000,000) |  |
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost | (13,000,000) |  |
Below investment grade fixed income securities |  |  |
Investment [Line Items] |  |  |
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost | (52,000,000) |  |
Unrealized losses having loss of less than twenty percent, less than 12 months | 21,000,000 |  |
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost | (20,000,000) |  |
Unrealized losses related to securities with unrealized loss position greater than 20% of cost or amortized cost, unrealized loss position of 12 or more consecutive months | 2,000,000 |  |
EMA limited partnerships |  |  |
Investment [Line Items] |  |  |
Limited partnership interests | 5,760,000,000 |  | 5,730,000,000
Carrying value | Cost-method Investments |  |  |
Investment [Line Items] |  |  |
Cost method limited partnerships | 1,740,000,000 |  | $ 1,780,000,000
Mortgage loans, non-impaired |  |  |
Investment [Line Items] |  |  |
Allowance for credit losses, period increase (decrease) | 0 | 0 |
Average impaired mortgage loans | $ 4,000,000 | $ 4,000,000 |

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