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Commitments and Contingent Liabilities Variable Interest Entities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Unfunded commitments | $ 40,841,115 | $ 37,308,102
Other Assets [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated Entities, Assets | 270,000 |
Other Liabilities [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Unfunded commitments | $ 89,000 |

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