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Investments - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Available for Sale Securities |  |
Short-term investments | $ 4,384 | $ 4,009
Accrued investment income | 359 | 339
Fixed income securities |  |
Schedule of Available for Sale Securities |  |
Accrued investment income | $ 327 | $ 311

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