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
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