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Summary of Significant Accounting Policies Newly Adopted Accounting Standards (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit loss	$ 11,430	$ 15,564
Retained earnings	51,006	40,088
Allowance for credit losses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit loss	$ 11,400	$ 15,564	$ 7,208	$ 7,220

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