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Investments - Sales of Available for Sale Debt Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale |  |  | $ 11,370 | $ 9,023
Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale | $ 4,000 | $ 4,100 | $ 8,200 | $ 7,200

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