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Investments Under Resale Agreements and Obligations Under Repurchase Agreements (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Investments Under Resale Agreements and Obligations Under Repurchase Agreements (Details) [Line Items] |  |
Fair value | $ 82,585 | $ 142,370
Repurchase Agreement and Securities Lending [Member] |  |
Investments Under Resale Agreements and Obligations Under Repurchase Agreements (Details) [Line Items] |  |
Fair value | $ 288,523 | $ 305,593

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