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Investments - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net Investment Income [Line Items] |  |  |  |  |
Payments to acquire investments | $ 1,617 | $ 9,496 | $ 16,448 | $ 5,051 | $ 35,713
Proceeds from investments | 3,173 | 5,567 | 15,739 | 10,619 | 45,489
Time Deposits |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Payments to acquire investments | 1,298 | 9,165 | 15,794 | 4,358 | 34,905
Proceeds from investments | $ 2,845 | $ 5,274 | $ 15,140 | $ 9,943 | $ 44,372

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