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Summary of Significant Accounting Policies Newly Adopted Accounting Standards (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for credit loss | $ 13,240 | $ 11,430 |  |
Retained earnings | 57,184 | 51,006 |  |
Allowance for credit losses |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for credit loss | $ 13,240 | $ 11,430 | $ 15,564 | $ 7,208

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