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Short-term and Long-term Investments, Restricted Deposits - Narrative (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2020 USD ($) position
Schedule Of Investments And Restricted Deposits By Type [Line Items] |
Accrued interest income | $ | $ 75
Positions from which gross unrealized losses were generated | 1,243
Total unrealized investment positions | 5,825
Commercial mortgage-backed securities |
Schedule Of Investments And Restricted Deposits By Type [Line Items] |
Investments recorded at fair value that carry rating of AA Plus, weighted average (in years) | 4 years
Rated Securities | External Credit Rating, Investment Grade |
Schedule Of Investments And Restricted Deposits By Type [Line Items] |
Percentage of investments in rated securities carry an investment grade rating by nationally recognized statistical rating organizations | 97.00%

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