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Related Party Transactions (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Related Party Transaction [Line Items]    
Due from Related Parties - Customers $ 28 $ 283
Due to Related Parties - Customers 1,197 999
Short-term borrowings 27 118
Directors, Officers, And Affiliates [Member]    
Related Party Transaction [Line Items]    
Short-term borrowings $ 0 $ 16