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Investments Under Resale Agreements and Obligations Under Repurchase Agreements (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Investments Under Resale Agreements and Obligations Under Repurchase Agreements (Details) [Line Items] |  |
Fair value | $ 65,531 | $ 82,585
Repurchase Agreement and Securities Lending [Member] |  |
Investments Under Resale Agreements and Obligations Under Repurchase Agreements (Details) [Line Items] |  |
Fair value | $ 85,322 | $ 288,523

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