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Investments - Sales of Available for Sale Debt Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale |  |  | $ 12,418 | $ 16,141
Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale | $ 1,500 | $ 2,900 | $ 9,600 | $ 11,100

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